Vansh 's thought and Plan My assumption -
Vansh ko vi pata hai ki woh zyada din Vihan ban kar Riddhima ki ankhon mein dhul nhi jhok payega. Kyunki after all she is his wife. She is smart and intelligent and at the end of the day she will catch him. Chahe jitni vi naive kyun na jo pakar hi legi and he was giving hint to her.
Lets have a precap what Vansh knows.
Siya ki phone se utna hi pata chala hai jo woh cliff se Jump karne se pehle janta tha...He has not known anything new. But so far he used to think tht Riddihima is spying on him nd someone is channelizing her.
Kabir revealed before arresting him that It was him who appointed Riddima as spy So he is aware that she is a spy made by Kabir. He also know Riddima allowed Kabir to stay here immediately after his funeal.She was about to marry Kabir.So us hisab se Vansh aj tak yehi socha ki Kabir aur Riddima ka plan usey marke uska Property harap na tha. Obviously usey nhi pata ki Riddhima has bear torture and Kabir manipulated her.
Now he took the garb of Vihan and try to check her reaction. Vansh was surprized that Why Riddima wants to banish Kabir? Jab woh khud uski spy hai? Now Vansh has discovered that she want to transfer his property to her own name So he is not aware of the real motive kyunki Riddhima yeh matter Vansh se share kar sakti hai par Vihan ko nhi. Ab Vansh ko lag raha hai ki Riddhima Kabir aur Vansh dono ko apni rastey se hata ke puri zydad enjoy karna chhati hai. He is still unware of VR trust. Now when he is suspecting her that she wants to snatch all the property Woh Riddhima ks samne challenge throw kar raha hai Usey dara raha hai Vansh and Vihan do banke usey confuse kar raha hai. Agar twin hote toh childhood pics hona chahiye tha. But yaha clearly edited pics dikh rahe hai.
Yaha hume dekhna hoga ki Riddhima family se puchti hai ya nhi ki VANSH ka koi twin bhai hai ya ni..
And agar Vansh Aur Vihan alag alag hai aur Vihan chupa hua hai then Woh kaha chupa hai itna lamba admi saradin chupke nhi reh sakta. And agar Vihan and Vansh are not same then what will b Vihan's role when Vansh will return as the heir of the house? Dono agar place swap karte toh .kavi na kavi toh pakre jaate ..So twin and humshakal theory avi k liye nullify karna chahiye.
I think in clues or mystery games se Vansh Riddhima ko yeh samjhana chahata hai ki They are same person.And we cannot outrule Aangre. He is definately helping him.