What if Marios' secret
 

is that he is actually a paid actor... maybe an ex-con man (and he's essentially conning them) or he's a BB crew member.

Maybe he has been like undercover since the start of the auditions/boot camp, and the tobola was filled with lil' Marios' and he's been a mole since the start, and they only put the mole costume and such on him at the start so that when he lost it they would think he's just like them.