I remember I hated his cuttlefish theory, but later started to go with the theory. Not because of his evidence, but a whole new thing I realized. I also write theories a lot, so I tend to question basically everything (I'm an INTP, it's what I do). It's way too complicated to mention in this topic, but maybe I'll bring it up later.
Other cases of people going with theories:
Splatoon 3 will have an open world story mode! (please no, Nintendo I beg you, that would suck with Splatoon's mechanics, trust me)
Inkopolis is dead in Splatoon 3 (pretty sure Nintendo said otherwise but okay...)
Splatoon 3 is in France (sure whatever you do you I don't care as much about this one)
Dedf1sh is an actual character (she's literally never been mentioned in-game)
Callie agreed to hypnosis (don't get me started with this, I think about the psychology of Callie far too often)
Nintendo confirmed Agent 24 (*rips out hair*)
Agents 5-7 exist (they don't.)
Agent 4 is 18 (*bangs head on wall* STOP)
The agents have canon personalities (no...)
Splatoon 3 will have no spawn camping! (pretty sure we all saw that normal respawn point with a tarp on it, didn't we)
Salmonids will be playable next (what..?)
Mr Grizz eats egg (that ones actually funny, I'll give you credit)
Mr Grizz is a real bear (if the professor is dead, how would some random bear survive)
Mushroom vs. Star wasn't canon (pretty sure I saw it happen in-game but you do you)
Dedf1sh is Agent 7 (WHERE THE @#$% DID THAT COME FROM)
The NSS is being mean to the Octarians (unlike many other main characters, I think they're actually doing good. It's Octavio's fault that most of this crap is happening, and I like villains that I can't feel bad for)
Clam Blitz won't be in Splatoon 3 (but it's the best Ranked mode...)
Dualies won't be in Splatoon 3 (epic. they're impossible to use, and brellas are a much better addition to the game)
Mr Grizz is evil (makes sense, but ya can't confirm that.)
The professor is alive (I would love a plot like that, but it's unlikely)