The bit about gray thing is that he appears to have "decided" already. He doesn't have any interest in changing at all, because he "knows" all about differences between Jedi and Sith. The impression we got is that he's got no room to grow.

Jedi that are open towards considering less than crystal-clear light side options is quite different from those that already have decided to stay at a mid-point.

EDIT:
We got net working at home today. Finally we can focus on advancing the RP more.