Early scriptures

I read your question.
First off, let me say no, but I'm not saying that the Mahayana sutras and the early sutras are superior or inferior in terms of content, nor am I a fundamentalist.
Please note that superior to the Heart Sutra is not the content, but “as an argument for talking about Buddhist thought in general,” as described in the previous answer.

Today, what is called the Early (Primitive) Sutras refers to a group of sutras called the Five Parts of Pali.
The structure of the five parts of Pali consists of “Kuddhaka Nikaya (small part),” “Dhigah Nikaya (central part),” “Sanyutta Nikaya (corresponding part),” and “Anguttala Nikaya (extended branch),” and “Kuddaka Nikaya (small part),” and Kuddhaka Nikaya, which are estimated to be the oldest sutras, are recorded in Kuddaka Nikaya.
Also, as the name Pali V indicates, it is written using Pali language similar to the Magadha language used by Shakyamuni. Pali is a slang word that is older than Sanskrit as a language, and there is also a theory that Suttanipata, a small part of the Pali 5 described by it, was established 100 years after the death of Shakyamuni.
The kanji of Akan Sutra, which is the Chinese translation of Pali 5, is a phonetic copy of “agama (what has been handed down),” and what has been handed down orally is gradually written as shown, so there are variations in the establishment, but for that reason, the older it is, the more it is thought that the older it is, the more it shows Shakyamuni's original ideas.
However, since places that are very similar to Jainism are scattered in Suttanipata, which is the oldest sutra, it is still being examined whether ideas other than Buddhism were mixed in, or whether early Buddhism was not as original as it is now.

There is a huge amount of content, so be sure to check it out with your own eyes.
First of all, I think it's easier to read all 3 volumes of “The Agon Sutra translated by Masutani Fumio,” which are recorded mainly in the corresponding section, which is older than Chikuma Gakugei Bunko.

As a contrast, I'll write about the Prajna Sutra.

There are many sutras bearing the Prajna Sutras in the Hannya Sutra Group. As an example, in the classification of Taisho Shinshu Daizō Sutra, there are Chinese sutras bearing 42 Hannya Sutras.

The Hannya Sutra Group is the spearhead of the Mahayana Buddhist scriptures and is the biggest batter. Therefore, it is often mentioned as a spear of Mahayana non-Buddhism, which states that “Mahayana Buddhism is not the Buddha's teaching, but something newly created.” This is not criticism from the Japanese Buddhist side; it is criticism from the anti-Japanese Buddhist side.
The rationale for this lies in comparison with the theory that is the largest sect of the Theravada part. In other words, the theory that there is everything explains “the reality of all laws,” while the Hannya Sutra Group explains that “the nature of all laws is unselfishness and emptiness.”

Also, the lucky idea seen in the early sutras is “those who increase thirst increase ignorance. He who increases ignorance increases suffering.” It was a matter of each person's heart, so to speak. This will be broadly explained in later generations to the state of the entire universe in the past, present, and future. This is true not only in Mahayana, but also in the upper seat. Here comes the philological impossibility of linking early scriptures with later sutras. The very establishment of sutras for later generations is a translation of Shakyamuni's teachings, so to speak.

In particular, the idea of emptiness in the Hannya Sutra was strongly expanded and developed by a school called the “Chukan School,” which took a clear form around the 5th century, with Ryuki (around the 2nd century) as its origin. “Commentaries on the modern Hannya Sutra Group are usually written based on the commentaries of the Chukan school, rather than the teachings of Shakyamuni in the early sutras.”

Note that the words of Hannya Haramitsu have the meaning of “arriving at the equinox,” and it can be said that the Hannya Sutra is a sutra that brings the Higan and Kongan to the forefront in particular.
On the other hand, the early scriptures say, “A person who has no equinox, no higan, no higan, no fear, and no restraint, we call him Brahmin.” You can also see the word “too” (Hakku Sutra 385). Brahmin is not a pagan; in the old phrase, it means a saint. At the same time, in the Pali language commentary, it is said that the equinocular equinox indicates eye, ear, nose, tongue, body, and konogishi indicates color, voice, flavor, and touch.

Keep in mind, I'm not talking about victory or defeat. It's just a story about no one preaching the direct transmission of Shakyamuni in the Hannya Sutra.
Also, there is probably a deep misunderstanding, but I am a person who reads the Mahayana Sutra as a continuation from the early scriptures.
https://hasunoha.jp/questions/11964
Even so, it's impossible to say that the Prajna Sutra is a direct explanation of Shakyamuni

Kisui-sama

This is Kawaguchi Hidetoshi. This is my humble answer to the question.

It is said that Shakyamuni's Den Falun has been performed three times.

Among them, the teachings of the Prajna Sutra are those mainly preached in the Second Dharma Wheel.

It's just, according to the “Deciphering Sutra,”

The first Dharma wheel is explained as describing various ways of being, starting with the Four Holy Tran, which is the first Dharma wheel, and the second Falun explains the emptiness, selflessness, and innocence of various ways of being, and the Third Falun explains how to correctly grasp the way of being as the middle of being or not.

Also, in Buddhist scriptures, when broadly classified into two categories, Shakyamuni describes what is true meaning and what is described as convenient for true meaning.

The former is the teachings of righteousness, and the latter is the teachings of unfinished justice.

That classification is very difficult if you look at it in detail, but if you don't mind, please learn about Master Tsongkapa's “The Heart of Good Essay.”

Kawaguchi Hidetoshi Gassho

All of the sutras were born from Shakyamuni's enlightenment.
I think there is also an aspect where if you follow the letters, today's content will be like licking soup stock.
When it comes to today's contents, endless sutras spring from my own treasure.
In short, when you forget your self-consciousness by doing zazen meditation or Buddhism, it becomes clear that all sutras may have followed your self, so don't worry about where to place a large number of sutras.
My own sutras rather than the sutras of letters. The present sutras.
Nyozekyo is all of the events I'm experiencing right now. Before they realize it, people try to add their opinions to these. So even if I read the sutras, I read them through opinions, so I can't read the true meaning even if I use the Heart Sutra alone.
If you use ascetic practice to extinguish the flame of opinion, you will become equal to self and the law. It itself becomes the sutra sutras itself. If you're not the person who became it, no matter how many famous university professors have translated the sutramaki, you don't understand the meaning at all, and it's bland and dry. I'm not thankful or anything. This is because the translator translated it as the meaning of the letters, so it is not part of the sutras. There were no sutras in the Buddha's time, so feel free to use the contents of sutras.
That ingenuity is to stay there and look at the life and death of one's own thoughts, unaware that they will happen or disappear, and reveal that they are originally in a state of disagreement. If you do that, selflessness, impermanence, and emptiness will become more apparent than letters.