If the evidence listed in this thread so far is the best evidence of a second shooter, the case for a second shooter is pretty weak.
The truth is there isn't any 'best evidence' of a second shooter. In fact, outside of the 'double bang' reported by many witnesses, I don't see any credible evidence at all.
If you think it's amusing watching the kooks try to come up with a list of the best evidence for a second shooter, ask them to come up with a list of the best evidence exonerating Saint Patsy.
Drool.