16-17 Roster:
G: Purvis (SR), Cassell (SR), Adams (SO), Gilbert (FR)
W: Hamilton (JR), Larrier (SO),
F/C: Brimah (SR), Facey (SR), Enoch (SO), Diarra (FR)
Hamilton won't make it past his Junior year, and you're losing two guards and two forwards. Assuming the 16 class fills out with a 2-guard, a wing, and a stretch 4 (for example, Diallo, Bailey, and Gabriel) then your returning roster for 17-18 looks as follows...
G: Adams (JR), Gilbert (SO)
W: Larrier (JR), Diallo (SO), Bailey (SO)
F/C: Enoch (JR), Diarra (SO), Gabriel (SO)
This roster is begging for depth, especially at point guard (hedging against Adams departure) and center. This is reflected in the guys we've been involved with early in 2017. KO has targeted several point guards, several wing shooters, and several big men.
G: Tremont Waters, Ishmael El-Amin, Nate Pierre-Louis, etc
W(shooters): Jermaine Samuels, Andre Rafus, Jordan Tucker, etc
F/C: Zach Brown, Ira Lee, Sam Japhet-Mathias, Billy Preston, etc
I would expect the top target to be either a point guard or a center. Adams leaving after his sophomore year is a possibility, and after a junior year I think more likely than not and you don't want to get caught with no guard depth, so I think 17 will include two point guard types, a wing, and a center, in line with KO's early targets. Just my two cents though.