Ideally, Self plays primarily with Diallo, Ellis and Bragg, his three most talented interior players, with Mickelson picking up the spare minutes and Lucas and Traylor relegated to mop up duty.
However, knowing Self, he will lean on his veterans at the expense of Bragg (only getting minor minutes now) and Mickelson (stuck behind Lucas even now). This of course assumes that he will play Diallo in front of Traylor and Lucas, which is no guarantee.
Diallo is the perfect compliment to the particular KU team because he can run around in the middle while the rest of the team is spaced around the floor in the four out game. Whether he's paired with Bragg or Ellis, either of those guys can face up on offense. If Diallo is out of the game, Ellis and Bragg can take turns inside since both can also step away from the bucket. This is the perfect set up to play four out regardless of personnel, provided that Self plays his best guys (Diallo, Ellis, Bragg, Mason, Graham, Selden, Svi and Greene if he gets himself together off the court).