"he could have stated whether he was shot at by Brown or Popkin, or Evans... "
I don't think he could tell us for certain either. A lot of people were shooting at him. I would say he's the worst person to ask. If i was to guess, he might even say
Roy Brown, because he actually turned around at one point and saw him. He probably didn't even know Mg's were shooting at him, other than the sounds if they even registered in his mind that was obveously screaming ...'#81 MUST FALL!'