Guess what?
There's a fascinating - and IMO highly important dynamic in this thread: the notion of the "what ifs" staying within the context in which they were offered, versus the "waiters" who scorn or reject or look askance at speculation on an Internet message board - one with certain membership parameters to be sure and thus far from the free-for-all left to the hoi polloi, but a mere techno-water-cooler sans geography through which the talk is plentiful and cheap, or cheap and plentiful, depending on your point of view. Regarding those who speculate, maybe it is worth recalling that OF COURSE they know to wait for NTSB's Probable Cause findings analysis & recommendations - they're readin' & postin' here, so this is a given, already. By like measure regarding those who would prefer nothing be said here about possible causality factors, it is worth recalling that OF COURSE this Community wants to share information, in a form and format inconceivable not so long ago, and something good comes of it, even if it just teaches a lawyer or barrister that approach flying is highly complex and causality analysis depends on many many factors and there's isn't a Big Teacher with an answer key to check the NTSB's work. IOW, even if the guesses are uncivilized backside (wild-arse in non-legalese), isn't the quest to lessen and reduce the holes in the Swiss cheese aided by having as many smart and informed fliers in the conversation as possible? That'll be two cents, Canadian of course, svp.