Bro we've been down this road before - you don't have to have your leg over someone's head to finish a kimura (though it is the ideal finishing position to maximize leverage/minimize escapes), and since the cage was there it would almost be impossible to achieve that position without dragging him away from the cage first.
I don't know how many times you can watch a video of that sequence or see posts like
@UFConFOX did with screen-grabs and still make that ridiculous argument.
Odds are Khabib would've never started talking to Dana if he wasn't confident that he had McG dead-to-rights (i.e. he wasn't getting out without cheating, even if Khabib wasn't breaking his arm that very second).