Both Jackson & Lipsey are around 6', but appear to have different skills. Lipsey is a ball dominate point guard who will get shots for his teammates. Tre has a decent handle, but I don't see him getting shots for teammates in a half court offense. IMO Tre has 2G skills.
Kalscheur, Grill and King are interchangeable at the 2/3 positions. If Lipsey gets minutes next year, I see him as Hunter's backup OR I can see Hunter and Lipsey playing some together. Lipsey might only be 6"1', but he is a strong kid and IMO can defend bigger guards.
The ceiling for next year's team will be the quality of 4/5 players TJ brings in.