There are conjectures of Kunal being illegitimate or Kunal being Parul's son.
Do you see a possible aggression or rivalry between Abir and Kunal particularly from Kunal's end once he discovers that Only Abir is Meenakshi's son?
May be he wud be jealous of Abir. And as Kuhu already hates and is jealous of Mishti may be the duo would keep conspiring against Mishti Abir or would at least keep distrubing their life with their hatred and jealousy. And Meenakshi would continue to hate Mishti as she would blame it all on Mishti.