Not convinced the nozzles are mis-matched when looking at the footage frame-by-frame. A single engine failure would normally also require some AB in the working engine - to within tolerable yaw/roll limits (which I'm not familiar with). Both of these tend to convince me that the engines are ok. I'd also be surprised if, as the wingman, he or she hit enough vortex off the lead to roll away that much.
I'm with Stu on this one...