And if he's horrible in pass pro, don't have him do it. Have him run a route, if they're in man someone will need to cover him. If it's a blitz, you've got one extra safety valve option for Josh to dump it off to. I know it's not quite that simple. But there are ways of ensuring he's useful to have on the field.
I think it certainly helps, but there's a much bigger element of luck involved too.