I hate to be wishy washy. Especially within 10 minutes of commenting on someones theory but that person's theory got me thinking...especially with how Heller and other writers have been toying with their words. Here is the writer from this last week about the explosion

http://www.hollywoodreporter.com/live-feed/mentalist-red-johns-identity-cbi-656671

Was it particularly difficult seemingly killing three Red John suspects -- Sheriff Tom McAllister, Visualize leader Bret Stiles and FBI agent Ray Haffner -- at the beginning of the hour? Was that always the plan?To be honest, that was one of the easiest things I had to come up with because Ken Woodruff wrote the episode before mine [titled "Fire and Brimstone"]. All I had to do was write, "Fade in. The house has blown up." I will say, fewer body parts made it in than were on-set that day, which was a personal regret of mine. I understand that you can't get everything out of life, but there was more than a foot there. Our show isn't normally that gory, but we wanted to make very clear that that was a human foot and there were dead bodies in there.

Now look at the italics and underlining. Is that sentence one that means..."some suspects were killed." Or does it just plainly say "there were dead bodies?" Because, as an earlier person mentioned, Jane could get cadavers and set up the whole thing. Everyone of those guys could be in on it...getting RJ. Jane finally had to go all out to beat RJ so he basically played his game and made the ruse so large that it would make RJ come out. 

Now, I will admit, I would normally call b.s. on these things because it makes it seem like the show jumped the shark. But the writers are perfectly riding the fence on what they give us. So yes those are body parts and yes they are dead bodies. But did it say those are those people's bodies? There were sheets all over the house covering furniture.