When a tomb is built, a “monument erection ceremony” is held.
It's a ceremony where people put their hands together for the first time after building a tomb.
It can be said that it is a ceremony of determination to join hands and begin praying for Nembutsu here starting today
There is no point in putting in a soul or letting a Buddha dwell in it.
Shinshu monks do not have such special abilities.
In the Jodo Shinshu sect, I think that when you run out of life, you will attain Buddhism due to the work of Amida.
The person who became a Buddha is not in the tomb.
Since the Buddha is free to exist, he is always by our side and protects us.
I don't know what other sects think, but in the Jodo Shinshu sect, graves are not places to enshrine souls, but places to remember important people who have become Buddhas and pass them on to future generations.