I would also drop Gee for Isaiah Thomas. Derrick Williams wheels may fall off at anytime but if he gets it right and unleashes his potential then he could easily become one of the best pickups with Love pretty much gone for the season. Dropping Gee is a low risk move..he's a decent player to own in some standard leagues but his upside isnt really high.
I would personally drop Gee. I do however think that the three players you mentioned are similar in terms of fantasy basketball value. Aaron Brooks was injured tonight and Evans is still healing from injury, so I'm not surprised that Thomas had such an impact against Miami. All said, I would drop Gee for Thomas.