It is an interesting question, because you are right.. There's various Guild's for unreleased classes.. There's even characters in the game of an unreleased race. I don't think he plays like a Gladiator, the opening movie shows an Elezen Gladiator, and she's built in heavy armor, a longsword and a shield. Classically Gladiator's thus far in the game are not light cloth armored dagger wielders. Also yes, he claims to be a bard. With the past of the Final Fantasy chain I see no reason to doubt this fact.. Bard will feature sooner or later.

I think he's a bard.