4 - we don't have a starting caliber 4 on the roster. Jaxson is currently slated for that role (ahead of Waterman I'd say) and he's too small. Ideally he's a 3, or at least coupled with someone a little bigger. We will miss GG's rebounding, who was 2nd on the team - who has a nose for the ball like GG did on this remaining roster?
Backup point guard - assuming Hall is healthy all offseason and can develop. If he needs surgery you have to get another rent-a-PG (similar to Rudi I'd say in skillset).
Fous should try to develop some face up game and I'd love him to take 2 3s a game, but I worry that we are still a year away for him. If Fous could have a similar to Yoeli's junior year. Even if Fous shoots between 30-32% from 3. He needs that part of his game to grow. More importantly is the questions around rebounding for the team. Hall / SJ / Saunders / Jax (or waterman) / Fous are not going to be able to rebound well enough. Move Fous to 4, and play Atiki or a transfer and there's zero spacing for a non-quick Hall to dissect defense.