User blog comment:KinnyKat1/Dabi Todoroki? Theory - Part 2/@comment-24403746-20180727170807

Ok as of this latest chapter, it's confirmed that there is a an unseen eldest brother Todoroki (Touya) which we are left in the dark with as to what happened to him thanks to Endeavor.

It basicly takes no genius to see that (unfortunatly imo) this is the set up for a Dabi is a Todoroki reveal.

Anyways we can't beat around the bush anymore, there are way to many similiarities and paterns that we all obviously know, which also takes away from the entire discussion and speculation about it.

So there's a highly guaranteed possibility that Dabi is in fact Touya Todoroki.

And that's it. ¯\_(ツ)_/¯