CONFIDENCE. It has clearly gotten into his head now.
As many of you know, I've probably seen more of his HS/AAU games than most and shooting was never a problem. There were a couple of mechanical things to tighten up but no big issues at all. If you remember, at the Late Night scrimmage he came out of the gate and popped a 3 like nothing. THAT is what I saw in HS. He was a PG who could get his shot pretty much whenever he wanted it, and shot a decent pct when he did.
Somewhere along the line here, doubt has set in. I still trace it back (at least partially) to not starting him from game-1. For a kid like that who is used to being handed the ball and the keys, that in itself can be a confidence set-back. Another possible factor is that being around older teammates who are frighteningly consistent in practice can make one question one's own accumen by comparison, and maybe become "afraid of missing" and thus, start steering and overthinking.
Any of y'all who've ever coached (or maybe it's happened to you)) have likely been around a player who got the yips for whatever reason. We REALLY need to get this corrected before it turns into a Steve Sax thing. In addition to the obvious --- reps and coaching in the gym --- at some point when it's appropriate in a game, Hubert needs to tell Eliot to start firing and not be afraid of failing til he can see it fall in the arena.