This is a serious question, and it applies to any continuity. With the exception of Sentinel Prime from DOTM, has there ever been an autobot that ended up sided with the cons? And by sided with, I don't mean in just an episode or issue or two and then every thing went back to normal. I don't think Wasp from TFA counts, as her was more or less in league with BA, and not so much a Decepticon (But that's just how I see it). If there hasn't, then WOW. Totally new territory in the movieverse!