Who should I take to r3 7*?

Dreamality

Yuvraj_267

Gamora is an good attacker but i should not prefer her bcoz gladiator is a beyond god tier champion after his buffz even better than gamora, their are only 4 cosmic who i prefer for 7* r3, these are knull>hyperion>adam>>gladiator. If you have one of above three, wait then don't rank up gladiator and wait for someone other in above 3