Part of the Task maybe??
For winning Peg Face I think he was called to the DR got the champers & trophy... then later in there BB gave him all the infos to the Crypt twist - skull tattoo, Aaron talking about dead spirits in the studios... it all fits!!
After Jay/Anton were removed he immediately said "They've not left this house"... maybe BB told him to speculate along with the others. No-one would be fooled by that fake eviction anyway... so Aaron's hamming it up to the others.
Now is he immune?! I wanna know!