I wouldn't go as far as to say he'd be a definitive leveller in that regard if you're up against a Champions League club with a similar stature of manager. But he'd certainly make a player's decision that much more tougher than Van Gaal in charge ever would.
For 90% of targets he levels things out. For the other 10%, we'd usually miss out anyway. On a realistic targeting side, he levels things out. Much better manager, removes uncertainty of last year in contract