CC had actually more than implied Warren and Jean more than once. Once during the Byrne era with Warren saying "looking good red" and she kisses him...
I would be alright with Gambit as a villain. New Sun or Deathbit needs to be addressed story-wise better without the frat-boy jokes. Treat the story...
Yes, I remember this and he didn't appear again until years later but Rachel had sacrificed herself by then. I wonder if he would go for her a third...