This entire post is based on if AJ Green commits to ISU. If he doesn't, obviously that drastically changes the outlook for next season. Just wanted to acknowledge that up front.
Primary Ballhandlers: Green / Williams
Guards: Holmes / Kalscheur / Grill (one of Green/Williams when both are on court)
4 position: Kunc / Tre King
Bigs: Ward / Osunniyi or Basile or Bates
There's your assumed 9-man rotation right now as of May 2. Jones is a big backup. Then you wait and see what happens with the three freshmen with King, Lipsey, and Watson and if any of them can play right away and steal minutes from one of those above 9.
As far as the, "where are the scorers"? crowd. Brockington averaged 12 a game at Penn State before jumping to 17 here. AJ averaged 19 a game for two straight years in the Valley. I'd be shocked if he didn't average 14-15 (if not more) a game here depending on usage rate. So there's your 1-for-1 replacement if you just want to simplify "who's scoring what Brockington scored?" But the new additions of Holmes, Williams, and Tre King will likely score more than the departures of Hunter, Enaruna, Jackson, and Walker. Those last 3 barely played.
And shooting wise, you have more perimeter insurance if Gabe or Grill are having an off-shooting night. Last year if those two struggled along with Hunter, it felt like we literally had no options outside of Brockington (who teams started to scout and prepare for better as the season progressed). If the roster looks like the above, I feel (or at least hope) that there will be more options than last season. Or least there will be more variance as far as where the scoring is coming from. And you will hopefully have 3 guys who can initiate the offense in Green, Williams, and Holmes rather than the 1.5 guys from last year (Hunter and sometimes Gabe).
And at center, we'll wait and see. Unless it's Basile, none of those guys are "throw the ball to them in the post and let them go" style of players. They'll score through pick and rolls, lobs, offensive rebounding, and effort. And I think if the center position is Ward, Osunniyi or Bates, and Jones, it will be better and more versatile on defense than just Conditt/Jones.