I looked at lineup data for the Rockets post-Capela trade. These are the 5-man lineups that have played at least 15 mins since then.
The core group of Harden, Russ, RoCo, and PJ is really good! Doesn't matter who plays with them. Just look at that lineup with McLemore; +28.9!

On the flip side, if any one of those four foundational players is taken out of the game their entire structure falls apart.

Should we be calling them Team Jenga?

One addendum to this thread. Apparently the super powers of the Rockets' Fantastic Four do not suffice to cover up the 'defense' and poor spacing provided by their Dr. Doom - Jeff Green.