I'm actually shocked by what I found. Up until now, I trusted the way you characterized usage.
Generously, 2-3 shifts per game accounting for both stiff and weak comp.
You can extrapolate from 2.4 + 3.8 to get 6.2% of toi variance to an entire season. Intuitively, a difference of well less than 10% says the impact cannot be very large.