Viprakshi, There are three possibilities for this.
1) I think this time it will be the groom who will hide his face behind the sehra so PF do not know that Dev is marrying Radhika.2) Because Avina were away on their trip to USA so they have used duplicates for this segment hence hiding their faces.3) It will be swapping of Dulha's Dev - Rohan.I read in an article that Barkha tells RP that Radhika has agreed to marry someone else so perhaps two marriages are taking place on the 21st ME.
oh that will be a big twist i think.
waiting for ME