https://www.brighteon.com/6ce05594-5f11-440f-b71f-232e0cfa168c
Arms expert believes there were four shooters, and says why. I find him believable, if for no other reason than the magazine on shooters rifle only held 30 shots.....and a moving gunman shooting at moving targets would need more bullets.
Let me know what you think of this guy at the link.