Ideally, to be a championship contender, a guy like Landry would be your 6th man off the bench. He hustles, doesn't quit, high energy. He is somewhat of a black hole, and lacks height, which is somewhat mitigated when you throw him in against a second unit.
Ideally, you hope to get Cousins and have him develop into a post threat/defensive big, with Thompson as having the ability to hit the elbow jumper. Both are long, very long, for a 4/5. Thompson is finesse, while Cousins more physical. Great combo. Not your most athletic combo, but not shabby either.
Bring in Dalembert/Landry in the 2nd unit. Dalembert requires zero touches, Landry gets to do what he does best; score in bunches against (usually) less skilled bigs than the starting unit, while not getting killed on defense due to his lack of height, which is mitigated by Dalembert's penchant for rebounds.
A Cousins/Dalembert/Thompson/Landry frontcourt with a guy like Brockman rounding out the rotation gives you a lot of flexibility. Smallball, use Thompson and Landry, which matches up alright with the GS bigs and such. Want to hunker down against a Dwight/Gortat combo? You have Cousins/Dalembert.
Defense, length by Dalembert/Cousins, offense by Cousins and Landry, hustle by JT/Brockman, rebounds by Dalembert/Cousins/Thompson, post offense w/Cousins/Landry, elbow jumpers and high post offense by Landry and Thompson. You can see how this sets us up for just about everything any team can throw at us.
That's how it could fit.