Massively, he was never getting that cross. Left the goal wide open
If he stays he's not going to stop it either, the guy has a free header from 3 yards out ! Not much he could do with the defenders not marking and not preventing the cross.
That's not really the mistake. His positioning was all wrong, too close to his near post. If he was in the correct position he gets it if he comes for it.
Not so sure, his shite defence were far more to blame though.