In that view, the last 4 were _after_ the string of 6 hits (plus one miss), which in that case are all misses. No harm done then, leaving nothing more than speculation about 2 seconds of mindset of a gravely wounded man who just successfully fought for his life and was still on an extreme adrenaline rush & in a deeply fearful state of mind. “Reflective contemplation is not required in the presence of an upraised knife” (nor, presumably, in the scant seconds after it is dropped).
Another consistent theory would be 7 “stitched” up the arm (3 close misses), pause, 4 at head with 2 misses. My interpretation of the autopsy sketch suggests arm & head may not have been part of the same “stitching”.
Could be, on your second part. I don’t think the first part works because it would mean that the killing shot that put Brown face down and on the ground a few feet from the cop was shot #7, which was followed by the pause and then four additional shots. If Wilson took those four additional shots after Brown was down (and likely dead) by the killing shot it opens up a whole bunch of other questions.
Yes, it’s all speculation. But still worthwhile given human nature to figure things out working in groups than alone.