Actually, spanishliz, the Context doesn't always help. All it is is the introduction to the quiz from which the question is taken. I just played a FIB to find an example, and although every question on this particular quiz (as usually is the case) is stand-alone, one of the Context blurbs is simply, "The last of my Goodquizzes." That wouldn't have helped a bit if the question had been imcomplete. There are many such examples.
I would guess Terry cannot systematically purge such questions with the push of a button or rewriting of a line of code. Each such quiz would have to be identified and individually excluded. That's an impossibly huge undertaking, but, now that I think about it, there might be enough FT addicts who so crave a red star by their name that they would be willing to help clean out these Augean stables. Every question caught would be a help.