Just caught up with new entry in show but I am not here to talk on it. I will like to predict or discuss on Rk's reaction to it. First I think the actor may be brought to fell RK's absence from show when Vivian will go for a leave of two weeks.
As we know RK consider himself to be superior and at par I do not think he will be jealous at soon at first place. As for how the new entry will enter that can also affect RK's sum up reaction. The new entry can be also competitive co actor or a friend so this can affect RK's co existence with person. Anyways I still think he will be related to RK's life. Back to RK I not agree with that he will be jealous at first place. Ya he can be jealous but not immediately.
Before he enters there is lot of track to build up Rishbala relations. There is Karva chot opening scene which will turn out to bge one faith in this relation by Madhu. This can also led RK to a spree of thinking. Then there will be diwali scene where Rishbala can come close and can be found to become friends. Rishabh may go to a spree of thought for this. All cosy and sweet moments of farm house will add to a growing effection of RK's. There was also a news in between that RK will propose well I still doubt for this news that when it will happen. Not so soon I guess he will propose.
I think RK Consider himself to one superior character and no spring of change can affect him to get down to his knees. If he do not like to get cozy with Madhu is because he will never like to croos the path and unpure a delighted Madhu as she is. He stays away to Madhu can be because he does not want Madhu to get closer. As he fear to lose close ones he stay away but a time bring them together and RK's heart may get ounch on this closeness.
I fell that this new entry might play a separation too rather than cupid. May be because RK as person himself is and the way he stays away from Madhu he can free her from 40 lakhs and also free from this relation. He may be able to go to sacrifice mode then jealous mode before. RK as character I think he will not feel jealous of anybody. Also when he discover that a new person is not correct for Madhu and after knowing some truth about a new entrant he will be there to save Madhu like a true hero.
This is only my prediction and interpretation on RK which may or may not be able to turn out to be true. What you all think about RK's reaction to this does share.