I understand your theory! But why would Vidyut keep Juhi alive? He doesn't want her to win Neil's love either? He wants revenge from her! Why not kill her? Unless he thinks there's another reason for her staying alive?? ( truth be told, Poonam seems to be liked by MB and Ketaki.. so maybe they'll keep her on despite the lack of acting skills).
If Avni is in jail for 2 years, as per the spoilers, then Vidyut would think he's won! What's the purpose of Juhi? And if she's alive and believes that Neil and Avni are seperated, then wouldn't she make a move on Neil? Thus exposing herself as being alive?