Personally, I would like to see them try "no true point guard and no true center" lineups. I think Cumberland, Cumberland, Williams, Scott, Harvey would be the most talented lineup they could field. Nova won a title in 2016 starting 4 guards that were 6'3, 6'3, 6'5, and 6'6 along with a single big man. Swapping out one of the guards for a true PG would also be a quality lineup, but Scott should be a C more often than not.
There would be a problem with rim protection, but aside form Diarra I don't think this team has a rim protector whose flaws don't overwhelm the benefits. The 7-footers should be mostly watching if this team is going to be any good.
I think the mix-and-match approach is best until we see what works. I'd agree that Cumberland, Cumberland, Williams and Scott are our four best players. But from there, the 5th best player could be one of a number of players. I expect early in the season we will see a lot of variation until we figure out what works.
We'd be giving up a lot of size to the other team if we play small-ball with Scott as the center. It's worth trying and maybe it can be done, but I think we'd have to really excel on offense (and pressing/creating steals) with that line-up to make up for our lack of interior defense and rebounding.
With Diarra's athleticism, I wonder if we could also see a big-ball lineup at some point. Cumberland, Cumberland, Scott, Diarra and Vogt/Sorolla. Scott and Diarra both seem to have improved at ball handling and seem just as capable at shooting the three as any non-Cumberland on the team. Doubt we would play it much, but could be something interesting to try now and then.