Fable 2 help in the crucible plzzzzz help------- easy 10 points?

ok im gonna keep this short. i am on round 4 and i have 4 perfects but i cant beat it. i want the chopper that u get from geting all perfects but i cant beat it right now. if i go on and beat the spire and come back and play the crucible can i still get the weapon cuz i really need it?