I think there can yet another loop closure if Radha never did a baby swap.
Aarti blindly believed her so called Father -Dubeyji but he cheated her as he could not tolerate P's death. But still AarYa forgave him. Similarly Radha, so called mother of Yash will do some extreme bad to Yash but still at the end AarYa will forgive her. I hope Akash does not loose his life as P in this whole ( somebody talked about this y'day).