He's pink!!

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He's pink!!
MANGA SPOILERS ALERT
Listen as far as I'm concerned the first and second holders of One for All were in love (or at least some kind of romantic relationship).
Think about it. What's the most likely way they found out that the first user, Shigaraki Yoichi, could pass on his Quirk through DNA? Unless there was someone around them with some sort of Quirk-identifying Quirk (which isn't impossible, but makes for an unforgivable--if unfortunately canonically likely--missed writing opportunity by Horikoshi, if you ask me) then the answer is obvious:
A kiss.
Spit contains DNA. As we know, the Quirk is passed on through the will of the previous user and consumption of their DNA by the next. If the first user was dying, but shared a kiss with his lover while hoping to leave something of himself to him in life, then it's perfectly conceivable he passed on the Quirk that way.
So given the recent leaks or spoilers for bnha there are some theories of my own I would like to consider.
Starting with the first one, THIS MAN is not Katsuki (all though I would be lying if I didn't say that I would be just as excited if he was). No, but this man IS a Bakugou and maybe at the time he is a Bakugou before the Bakugous where called Bakugou, perhaps on Katsuki's mom's side?
I believe that it's horikoshi's plan to have us believe this is Katsuki and for even Izuku to go, "... Kachan?" Once he sees the holders face only for the guy to introduce himself and we get the reveal that his is one of Katsuki's ancestors but the guy is just like really really calm. Maybe even a straight up call back to how horikoshi first intended for Bakugou to be like.
One to the second one. Why ARE the second an third holders facing the walls? I wonder if it's because Izuku hasn't unlocked their quirks yet. Or maybe! It's because *they don't want him to use their quirks yet*.
It's just a couple of ideas that I've had and I mostly just bandwagon on theories so if anyone has an insight or something to add on please do! It would be interesting to hear.
Listen, it's not that I don't want the second holder to be Katsuki, because let's be real, I would love it. No, I don't want the second holder to be Katsuki because right now in the story it *wouldn't make sense*, it would feel like a cop out really. I would be far more interested in learning about the relationship between first and second with second not being Katsuki than it actually being him. And if you HAVE to have it be that way then I will be even MORE interested in it being an ancestor! Imagine how awsome that would be???? And maybe a story in Katsuki's family about a very distant cousin, a man considered to be a vigilante to the family? A small, small part, reason, for the guy wanting to be a hero.