Somebody at this point even want to imply it was not the Arabs?

The question now is which ones. Hints from some of the better connected sites and youtube channels that I watch are that it was revenge for some particular series of drone attacks, probably Yemen, but at least some of those guys looked like straight up pros. Their physique looked too athletic to be someone just recruited on the basis of "belief". Only one was obviously not an athlete, and that is bum looking guy with one of the backpacks, but it might be possible he actually was a bum who saw a well dressed arab set the pack down, though it was something valuable, and tried to slip away with it.