Great post J,

The only thing I can add is no study of the clinch is complete without looking at how it's performed in Muay Thai.

Muay Thai adds elbows and knees from the clinch, and I don't think any art does this as well as Muay Thai.

There are also limited trips/takedowns allowed from the clinch in MT, but obviously nothing like the wrestlers clinch.

A good study of how the clinch is used in wrestling, MMA and Muay Thai will add a whole new dimension to your fighting ability.