You make an interesting point that it is not just bad, that it is shockingly terrible. I have seen the Hewitt offense likened to a pickup game where good players are just kind of doing their own thing to get to the basket. Obviously, I don't have statistics on pickup games, but I would expect more assists in a typical pickup game. If I am correct, then you may be right to imply that Hewitt makes it worse than it would be with no instruction at all.
I like your #HewittFactor tag. There is also PHUF as coined on other A10 fan sites: Paul Hewitt Un-coaching Factor.
I used to half jokingly say that Hewitt is making some of the guys, and the team as a whole, worse the more time he spends with them. Evidence seems to be continuing to build that maybe I should say it seriously...