Can i use hex for a gladiator beast contact fusion summon?
No and no Contact fusion works by having the appropriate monsters on the field, and than contact fusioning them, Hex-sealed fusions are not considered as gladiator beast, and future fusion is like polymerization which is not like contact fusion at all. You need cards that steals name or acts upon them, as in prisma, or phantom of chaos which copies a gladiator beast name, so you can use them for contact.
