I don't think I feel so good about the cutie mark thing... It might be some sort of anti-equality thing going on. The fact that the offending mark itself looks a little like a grey version of the Gay Equality symbol makes me a little queasy about some of the theorizers taking it a little too far and will be saying things like "OMFG MLP REPRESENTS ANTI-GAY IM LEAVING TH FAND0M111". You may say I'm exaggerating but there are really some people like that.

All in all I'd say maybe make the offending mark a gray square instead.