There is one major loophole here...unless the CVs handle it well.
Did Riddhima tell Vihaan yet that Anupriya is the main culprit? Agar bola hain toh Vansh ne believe kiya?
Being Vihaan, he cannot contest Riddhima n has to accept whatever she says. But being Vansh, will that not be a shock for him?
Vihaan's expression today while talking to Anupriya was strange. He was observing her drama as if he knew.
If we go by flow then it seems like he is suspecting everyone if he is Vansh becz he knows that someone from family is betrayer other than Riddhu.
If Riddhu told him that Anupriya n Kabir had planned everything then he won't believe her but he will definitely try to dig out the truth but won't trust anupriya and play his game along with Riddhu's game.
But if he is not Vansh n actually a looklike of Vansh then all is moot point.