I know only of Arthur Daniels as a black shot by him, and we don’t know under what circumstances—e.g., if he had been confronted by him.
But a heavy violent video-game player who had been under psychiatric treatment at least at some point fits the usual profile of this kind of killer.
Davis was shot in the back at an elevator
Since Mr Davis was a govt contractor installing office furniture and the shooter dude was a low clearance contractor who worked to refurbish computer equipment, it's possible they knew him or recognized his company uniform which was supposedly all-blue
You'll have to read the Brit tabloid press (try Mail Online)
They will have details you will never see in the US media
It was noted on FOX last night at there would be govt surveillance street and building cameras of every move made by this guy before he even entered the gates of the base
So if he shot a guard and took guns it is on video and the FBI has it
One of the people interviewed by Greta Van Sustern was the former commander of the USS Cole who was talking or texting 2 former Cole shipmate survivors as they were in the middle of this massacre