So why exactly does everyone seem so positive Erdrick is a fighter exactly? He sounds like leak bait if anything given there's no concrete evidence.
I think it's sort of been a self-perpetuating thing. Verg, and subsequently lots of "leakers" and "insiders" claimed that Erdrick was in, and that, in conjunction with the fact that the codename "Brave" lines up pretty much perfectly with his inclusion, makes it at least
appear that those people have the right idea.
Additionally, Dragon Quest is having a
hell of a year, from the announcement of DQXII to their weird not-Pokemon-Go, as well as the Switch ports of Builders 2 and DQXI. All of that makes it seem like, if Square Enix is going to get a rep, Dragon Quest is where it's coming from.
But like you said, there's really no concrete evidence one way or another, as far as I'm concerned, so for me it's pretty much "wait and see."
EDIT: Oh yeah, I forgot about Tansut. He's the one who clarified gender variants for DQ's rep, right?