I thought this too.Sk can always claim that jannat is Sk.She has no papers and could be pretending amnesia.Shaad is shown as a stupid person .No one in the house realises that phupholooks worried and hassled always.How come shad does'nt remember his childhood friend's face?He does'nt look like an army man he left the watch on the table and is discussing about Sk in a loud voice.the servants could hear him.
I think next week SK will try to convince shaad and his dad that jannat is the real Sk.she knows how to talk in a convincing manner.She is tanveer's daughter,after all