Yeah, you're right, 8 of the teams would struggle.
But you wouldn't score 30, not even playing for Rangers or Celtic. The defences like to 'dig in' against the Old Firm which is why you do need a little - not much mind you - skill to do well.
I would put my life on it that one of my friends is better technically, fitter & faster than Maurice Ross right now....I want to see him play for Rangers goddamnit!