Yes - I draw it so that all the pressure is on the spine. Even when I do it very carefully and slowly, it dings the edge in several areas - not the entire length of the blade mind you, just certain sections. Are you sure yours isn't getting dinged in a few areas? Have you tried checking it against a light? I guess you happened to receive one of the better sheaths...
No, mine remains virtually flawless, or as near flawless as any blade can be, when I pull it out of the sheath. I suspect that if I were careless in how I drew it from the sheath, it might be a different story.
Another thing that occurs to me is that not all sheaths, and not all knives, are created equally. No matter how careful a manufacturer might be, there's always going to be some variation from knife to knife, or sheath to sheath. Different examples of BK-2's can have slightly different grinds, and some sheaths may be slightly looser than others along their lengths.
It could be that the knife/sheath combination, as designed, is just perfect, but, alas, "as designed" and "as produced" are two separate things. Since the blades are ground by hand, there will be some variation. The forming of the kydex sheath, and its riveting, can vary as well.
I would imagine that the greater percentage of the BK-2 knife/sheath combinations fall within tolerances, and have no problems whatsoever. My guess is that a certain small percentage of the combo's shipped are going to result in a slightly too large knife in a slightly too small sheath, resulting in a dulling drag when pulling the knife from the sheath. The opposite can happen, too, resulting in a combination that never drags and never dulls an edge.
I may have one of the combo's that works just as intended — as I suspect most people do.
Perhaps — one day — Toooj will weigh in and give us the definitive answer (probably not before Blade, though).