Kimi causes engine blows? Bollocks! To any objective F1 fan who is not ignorant, it is well known that McLaren suffered infamous reliability problems during the time Kimi was there. The reason Kimi suffered so many problems is a combination of bad luck, and also because he was able to drive the pants off the car more so than Montoya. Kimi always was able to push the car to the limit. Kimi has even shown that he can drive a damaged car fast, until it falls apart or the engine blows.
Before Kimi got to Ferrari, they had reliability issues. Check the 2006 season where both Massa and Schumi had a few reliability issues. Also it is correct that Massa arguably has had more reliability problems over the past few years than Kimi.
I also don't see where people are getting this idea that Kimi is going back to McLaren. Where is the source for this? Kimi never got along that much with Ron at McLaren, and he left the team on a bad note. Kimi really was happy to leave the team. I would be really surprised honestly if he goes to McLaren. I personally think that Kimi either will go to Brawn possibly, maybe Toyota, or just retire.