“Second guy on left with bad arm”
He looks nothing like Suspect #2 in the FBI photos, who looks Person or Lebanese, and if you study the FBI videos carefully, Suspect #2 appears to have a normal left hand and arm, and indeed is using his left hand to operate a cell phone in one of the photos.
I believe the image in the video is reversed; the high-res photo posted earlier that we have zoomed in on white-hat guy shows a bad left arm.