As Tyler heard Levi drawing a comparison between him, Mammon, and the current Behemoth of Envy Levian, his mind instantly went to the only connection he shared with Mammon and that was the fact that they were both originally from a different world.
While there was no way for him to be sure that they were both from the same earth, that didn't really matter to him in the grand scheme of things as there was a chance most of these reincarnated souls wouldn't be able to retain the complete memories from their past lives.
The problem only lies in the few souls that are somehow able to retain their memories and ego through the soul shredding process of transmigrating through dimensions.
A soul that was crossing over to this world would literally have to be been disintegrated and reconstructed thousands of times before it would be capable of surviving in another plane of existence.