What is this based on?
Have you ever heard a bad word spoken about Noble from someone actually in the game? First time around the players all got on well with him and they laughed and joked about how he wasn't very bright, the same way most of them do now with Matt Tootle, if Tootle got the odd red card every now and again would that make him all of a sudden "a bad egg that could disrupt a whole dressing room"? I don't think so.
Noble got sent off too many times for Notts because he was stupid and in some cases unlucky. Since then he has clearly worked hard to turn his career around and was brilliant for Forest Green in the conference. This season he had family problems that were nothing to do with football or anything in the dressing room at FGR that were obviously causing an issue with his form/appearances for Forest Green and that led to him being allowed to leave so he could fix his off the field situation.
Honestly i think it's a ridiculous suggestion and I'm not really sure what it's based on.