Another "professional" that don't know his you know what from a hole in the ground.
I fail to see how any of his "causes" pertain to your symptoms.
Rule #1:
ALWAYS CHECK THE CHEAP STUFF FIRST!!!
Top of the list is the UVC connector just came apart. The problem is common enough that Ford came out with a little plastic piece that keeps the UVC harness connector from doing that. It should be a standard item to do anytime you take the valve covers off for the first time.
Second on the list is a bad UVC wire harness. If the problem isn't fixed after doing that, then you are talking $$$$$$$ like IDM's.
I can't see how one bad injector will cause the entire side to go bad.
Good luck.