There are six theories under investigation regarding the fate of the missing Malaysia Airlines flight, reports NBC News, and most will sound familiar at this point: hijacking or pilot suicide, for instance. But there are far more than six theories being floated around, and Business Insider picks up a particularly fascinating one that Henry Blodget dubs the "most plausible" theory yet. It comes compliments of former pilot Chris Goodfellow, who makes the case that the pilot was a "hero" who was responding, properly, to a fire on board. Goodfellow lays out the timeline on Google+.