Mohan was recluse, bitter, brooding, confined to four walls of his room/house for many years,😒 he is generally anti-social, against participating in gatherings, festivities & celebrations with outsiders 😳after wife Tulsi's death.
In addition to his name wrongly linked to T's murder scandal that's still not leaving his back, Mohan is now also disturbed with R's cheat forced wedding, his character publicly tarnished as if a womanizer.😔
Suddenly showing Mohan in RM mingling with some external guests by grandly celebrating Mahashivratri & Holi with NO issues, cutting silly jokes with groups, enjoying songs & dances, showing up as spouse of R, doesn't make sense at all for his character graph.