The king has not watched the show from the start. The chosen one had to take time off his royal duties and favourite past tiems and spent time watching the show from the time Sooraj asked Sandhya to leave RP. So all his views are based on the story from then.
The king believes there are various reasons why Zak and Em would not work as a couple.
Firstly, and most importantly is because of SurYa especially Suraj. Their characters have been etched such that theu will fight against all odds to keep the family together no matter what the situation. Hence it was no wonder that after the BS revelation SurYa stood behind Meenakshi thereby saving her marriage from falling apart. Sandhya although a IPS officer chose to turn a blind eye towards the crime committed hence it wouldn't make sense if she wouldn't support Mohit-emily jodi now. As for Sooraj, he is like a father-figure to his brothers sharing a paternal bond with them. Just like how he will forgive Ved for any wrong, he will forgive his brothers too. If RP is like a garden of flowers then Sooraj is the sun who gives the light to each flower to blossom (and achieve their dream). It would be completely out of character for these two to support Emily's remarriage.
Secondly, this show is about the RP. If Emily gets married to Zak then they will either have to cut her character out of the show or have a track for them separately. That is highly unlikely to happen. Also then they will have to introduce another character for Chavi and have another track for her. The king predicts that there is a high probability that Zak may be used to bring about a change in Mohit.
Thirdly, Emily cannot be remarried before Chavi whose marriage has already been broken. Hence it makes more sense for Zak and Chavi to get married.
Lastly Mohit is the most confused character. Not for the viewers but for the CV's. There has been zero justification for his actions. Initially he loved Emily and had no prpblems whatsoever. Later he disowned her, their love and their child which was understandable as he feared his family. But it made no sense in him hating her even after their marriage. During Hijack track he suddenly changed and worked in the MKD but immediately after the hijack track he wanted to cheats his parents of their house. Finally he got a good job but then ran away to become a sanyasi. There is no justification in any actions that he has taken. It wouldn't be a surprise if Mohit again changes at the last minute and unites with his wife and child.
*king*