I hope hori won't pull a D&D, throw all of his foreshadowing out the window and pretend dabi had no chance of being touya in the first place. I hope we'll be rewarded for paying attention to his story.
this being said maybe he's not touya and there's a better solution to this mystery! in which case I'll accept it because if hori had another plan in mind all along, it's probably a great one.
in any case this is a good opportunity to, once again, think about the ofa silhouettes because.... dabi's name was hidden just now, for Reasons.... and the silhouettes were hidden back then, for Reasons.......... gets me thinkin
the reasons are "it's a secret just for magali" and with that I am glad and honored to announce kiribaku is canon