User blog comment:Soma "my wife left me and took the kids" Proxy/Will the final villain of the series be Shigaraki himself or someone entirely different?/@comment-26373999-20190808081724

Without Power Level discussion (cause thats all theoretical) it would be easier to describe story wise.

Yes

Mha has built itself of the next generation of heroes of villains based on those before them, especially the future No1 Hero Izuku and the Future No1 Hero Shigi. Its there evolution into symbols of peace and doom. And they can't pull a big twist like "oh its actually all for one" because that All Mights Arch Nemesis, not Izuku's.