No, I wouldn’t say so. Vital has found a way to be efficient the last two years.
Last year was his best as he posted his career high in TS% (61.2%, 134th in the country). The year before, it was more due to getting to the line and limiting TO.
In 2018, he was the team’s most efficient player and he trailed only Polley last year with a significantly higher usage rate.
Rebound%
Vital: 5.5% Off, 21.8% Def
Bouknight: 12.2% Off, 12.2% Def
Vital is the team’s best defensive rebounder, and the team is 207th in the country in that category, meaning they can use every board they can get.
Bouknight’s offensive rebounding is awesome but in its current state, probably unsustainable and he’s much worse on the defensive glass.
Defensively, Bouknight is longer and more athletic, but Vital is 5th in the country in Stl% (a ridiculous 5.9%) and undoubtedly understands Hurley’s scheme better.
IMO, Bouknight would be taking more minutes from Polley than Vital when he plays more. Polley is efficient as a scorer, but as a low volume player he can disappear for stretches while giving you very little in any other category. But that’s just my guess.