Couple thoughts...
First, I'm not fully convinced Jamie is going to be back next year. Not saying anything is likely, just some curious things happening... Anyways, set that aside.
Second, to Moose's question above, there is going to be some significant roster change vs what we saw this year, though it may not feel like it. I expect no less than 2-4 transfers out, and at least 1-2 transfers in plus Souleymane (goes by Sou). The difference will be felt when it comes to minute distribution and production on the court.
Third, losing Farabello this year was huge as he was one of the team's more important players given his 3pt range. He was a 40% 3pt shooter his freshman year, and was up to 45% this year before his COVID injury. He seemed to be thriving in the off-point role, and you can easily see how much the team suffered having to trade his minutes for Fuller. Fuller is a nice guy, but just isn't somebody you want to give more than 5-7 minutes a game to.
Fourth, you absolutely saw several young guys grow and progress in major ways last year that will be important for 2021... Miles, Frank, and to a degree O'Bannon all grew up a bunch. That should continue this offseason as well.
Fifth... We have to hold on to our critical pieces. If Miles leaves, for instance, things get really really dark. I know the staff is highly, highly focused on this.
Here's how I see the roster and "depth" shaking out for next year... Smaller but faster team next year, more up/down:
G - Miles / Transfer1
G - Nembhard / Farabello
SF - O'Bannon / Frank / Transfer2
F - LeDee / Easley / Sou
C - Samuel / Sou
Farabello and Frank are your 6th and 7th men, Sou spells Samuel and gets 7-10 minutes a game, LeDee continues his progression as a solid defensive/rebound/role player.
I expect guys like Todd and Fuller, to the extent they are around, to have more limited minutes pending injuries.
Overall, if they stay healthy, this is a senior team that should be able to produce a 5-7th place finish in the big 12 (.500) and sniff the tournament. Probably more a high-level NIT team, but you never know.