Never fold aces
I would never fold aces pre flop, especially in a freeroll! As I see the situation, in a 5way allin pre flop, someone will has a very good hand like QQ or AK, someome other will has a good pair like 99 and someone else will has a small pair or a suited connector. And one person remains who could has a troll hand, like 10-8 off. Also some of them may have less chips than me so there could be side pots. To conclude, I think I have about 50% to increase my stuck after this hand if I shove and this is a good chance!