I don't think they're actually going to think the MC is behind this. I think Jacob was just in shock that there was a camera in there, and was still trying to procees everything. If you really suspect a specific person, are you going to that person without any evidence, and say... "You're still with us, right?"
When you think about it, the DIKs were pretty much done when the house got destroyed, and Rusty's dad refused to throw more money at it. It was the MC who pulled them all together, organized the gameplan, and directed the efforts. He even had his dad bring them furniture. Why would he go through all of that if he was not "with them"?
So, there's that, as well as... Derek would take a bullet for him... and Rusty appears to fully trust him (especially considering how he helped with the Cathy incident). Tremolo has to be in the clear.
You know there's going to be drama, so they'll most likely start pointing fingers at each other. They'll probably sit on the info for the time being. If they do suspect a rat, they're going to want to observe behaviors, so it would make sense to not disclose the information to everybody. So, those in the know would be... Rusty, Jacob, Derek, and since they trust him (and we control him)... the MC, and then probably Tommy (since he's VP). From there, the witch hunt begins.
I'd imagine the first DIK they'll focus on will be Nick. He's the low hanging fruit, and the first they'll suspect. It's all there... his ties to Vinny, his untouched room when the house was destroyed (some of the guys had to have picked up on that), and then (of course) Tommy will want to go after him when he finds out about Heather.
Also, I don't recall if this was revealed, but what did Vinny take from the safe at the end of the Halloween party? ...and, how did he know the combination? I thought only a few knew it.
I mean, this is all speculation... but I have a feeling that it'll go something like that. Our guys have just found out that each of these isolated incidents are just part of one big set-up. This story can't continue to go on with just partying & bangind sluts, can it? Season 3 will be about uncovering what is really going on.