Cedi should start at the 3.
Last ten games, he's part of the best 5-man lineups with 10+ minutes played per game.
Including:
Garland - Mitchell - Cedi - Mobley - Allen (120 offensive rating, 79 defensive rating)
Spacing with the starters is key. Stevens doesn't provide that because defenses don't respect his three point shot and won't rotate to him like they do with Cedi.
Fifth option Cedi shouldn't be too out of control and he can generate some transition points.
Cedi is part of the truly absurd net rating lineups with 10+ minutes of sample size (last 10 games).
-Garland - Okoro - LeVert - Cedi - Mobley. In 19 minutes, 148 offensive rating, 74 defensive rating.
-Garland - Okoro - Cedi - Wade - Allen. In 11 minutes, 183 offensive rating, 65 defensive rating.
First positive lineup Stevens has been with is a 7 minute lineup which also features Cedi.
Lamar with the starters (DG, Mitchell, Mobley, Allen) has been 'okay'/not absurdly bad in 63 minutes played, but it's been a negative (111 offensive rating, 117 defensive rating). Doesn't make sense to start Lamar in place of Wade. I don't think defenses are going to change their strategy with how they guard Stevens any time soon, which makes it tougher on everyone. With that said... The starting unit with Stevens could improve their defense and all of these are limited sample size but... Yeah...
Would rather just start Cedi at the moment.