I asked this in the last MGS5 Spoiler thread, but it got buried in the last couple of pages:
I just got the Truth tapes and now I'm even more lost than I was an hour ago! Not because of the body double thing (that was hinted at in the prologue), but instead from Skull Faces motivation to attack Snake. I get that he hated Zero for a number of reasons, but the only connection to Snake is doing the XOF secret work on operation Snake Eater.
Now, I was willing to just take that as bad writing (Snake didn't have any idea about XOF, so why try to get revenge on him?), but then Skull Face actually acknowledges that Snake didn't know about XOF, and that he has no reason to hate him (in the Paz interrogation tape), and instead that he'll just attack him anyway. So.... why exactly does he blow up MSF?