It's not like he's lapping his teammates though, especially at ES.
That -15 in those 12 games also stands out. He's been really really not good defensively, especially through the neutral zone. He plays a ton of minutes on a terrible team, so you'd expect a terrible +/-. But even relative to the rest of the team, his numbers are poor. His relative 5v5 possession numbers pale in comparison to that of rookie McDavid:
Bedard
rel CF%: -1.37
rel xG%: -0.52
rel GF%: -1.36
McDavid
rel CF%: +4.54
rel xG%: +8.51
rel GF%: +10.70
He's going to be a tremendous offensive player, he's already a bonafide genuis inside the offensive blue line. But this suggests that, as predicted, he isn't going to be able to drive play like generational players are able to.