As I said in there, the "thank you" theory can be applied so widely that it's ultimately meaningless. Sakurai has A LOT of people to say thank you to, and the reasoning for narrowing it down so much is entirely circumstantial, and not even a month after the guy said "it's more important a character is fun than recognizable". And that's even assuming the theory is right, which is reaching on its own.I think most of the guys at the Geno thread are solid about him being FP5 is because of Fatman's "Thank you!" theory. Fatman said that Heihachi and Lloyd were guest in Soul Calibur at certain points and that it would make a ton of sense if their Mii costumes came back with Nightmare because of that.
The amount of times Fatman has changed his story on this doesn't make him or his theories look very reliable tbh. You're not supposed to work backwards from a line of thinking to look for reaching clues to justify your own biases, your supposed to come up with a theory that can stand on its own.