Mansen and mamaji have always plotted against sid family! but yuv and gunwanti have plotted to kill people!!i mean mansen wants his way but not by killing people he always wanted his property back and would keep trying to do so!!
Mansen even felt guilty when satya was killed he never intended to kill him and now he is not happy when arjun is killed too!! He never wanted to kill people for property!! also he always had a solid reason for hating sid family that sid was mansen's fathers another wife son!! Now think about this and surely anyone not just mansen would hate sid!! But even still he just wanted to remove people out of his way for his property and not to kill people!! Then he is also worried about his own son who is doing more and more mistakes!
well its nice that mansen is not supporting yuv and gunwanti and trying to patch with sid well it could be because he is feeling guilty for what he did with arjun so!
then with yuv and gunwanti there is no need for more villians they would complete the task properly!! So mansen although wouldnt say is positive has not supported yuv!!