C'mon you guys, don't get too deep into this thing. Leave it as one of those mysterious things that can still be used as the probable cause of those un-explainable accidents that happen from time to time. You know the story, "Musta been jack stall, couldn'ta been anything else. He's too good a pilot".
On the other hand, if someone can provide real evidence that boosted flight controls commomly lock up while the particular type is being operated within its certificated flight envelope, then we need to ask some really serious question to the various airworthiness authorities who have certificated it. I would think that the FAA for example would cancel that ship's type cert in a heart-beat if this were the case.
'nuff said.
STL