My guess is that I don't have the "New Kristine"---mine was ordered in December and was one that was on clearance because it was a discontinued print. If it has more padding, that is definitely a plus, but just be aware that there isn't necessarily a lack of padding in the original Kristine, just not as much and not as rigid as the padding in the Crumpler.
As far as the gap between the flap, I think it was a little of both. When the bag was fully loaded, I would adjust the buckle so that it was as tight as I could make it but over the course of a little while, the buckle would loosen, causing the flap to not lay snug against the actual body of the bag. Because the flap was loose and not really secured over the top of the bag, that is when my camera found a way to fall out.
I'm not really positive how it happened specifically since I was in complete shock that it did happen---all I know for sure was that the bag was buckled (although loosely from being loaded with my camera and lenses) and it managed to slip through an opening.
Again, this hasn't discouraged me from using the Kristine bag when I'm out shooting. I brought it to DC with me and ended up using it after the first day when I found my 6MDH was just too big and heavy. I wore my camera around my neck, carried one lens, a water bottle, my wallet and cell phone in the bag. My main rule is that if I'm carrying that bag, the camera stays on my neck unless we're breaking somewhere for a meal or I need to use the bathroom, etc. and I try not to load the bag up too much---maybe just a lens and a speedlight or two lenses.
Even though it would probably be fine to walk around all day with the camera tucked away in the bag, after my experience I just don't feel good about leaving it in there.
Edited to Add: FWIW, I just looked up the "New Kristine" bag and it looks like a pretty vast improvement over the regular Kristine that I have. The fact that it can stand on its own alone is well worth it to me. Mine is very floppy, not firm padding at all---there is absolutely no way the bag could stand on its own---it's more like a cotton sack sort of. The material also looks better---rougher and more durable. Like I said, mine is more like plan old cotton.