Gokudera against Gamma? I get that he's trying to get revenge, but he had trouble against a D-Ranked member. He's stronger now, but I doubt he's that much stronger. Tsuna's more fit to fight him, anyway. It's his way of showing Hibari that's he's at his level.
I'm thinking it'll be more like this:
Tsuna - Gamma/Irie
Yamamoto - guy with sword
Lal - Starman
Ryohei - probably Afro, but it's not definite
Gokudera - probably Turbin, but again, not definite on that