I think it was very neccessary for Vishaka to come back before marriage, rather than afterwards..........Good sign, that success has gone to her head...........now, it will be quite interesting to see how she reacts seeing Amma.....................
 Reason that I think it is important that Vish is back now coz of the following view points:
  
 Very first time, when Shastriji takes the proposal of Radhika, the question of "Praya mard" coming in middle of the night, got resolved.......Hence the vign of her character got resolved.............
  
 Then came the vign of marrying again, which got resolved through Shama Vrat............
 Then came financial Vign..........which got resolved through Puny Daan............
 Then came her vign of unknown lineage...........
  
 So, societal, finanicial, birth all those vign have been resolved.........but the biggest vign is the vign of being second wife, or the accusation of stealing Vish's adhikar and her pati.............if this is not resolved, then it might haunt Radhika's married life............hence this has to be resolved..............Yesterday they showed Nandu, and Rads explaining how important this marriage was for her............before that it became clear that Dev's horoscope has no scope for second wedding.............now the entry of Vishaka.................it is blessing in disguise.............Success has gone to her head............for all you know, she may give Amma shock of her life...and hopefully Vaishali too...........and this last vign may be out of the way, (at least for sometime now............till she may come back, when she is no longer successful.................)
  
 I feel Kanha is untying all the knots..........And the story and all the characters are finally come back to the same place (Vrindavan) and the same situation as before..............story has come full circle.........But big difference now is Radhika is bride to be of Dev..................
  
 It will be an interesting, how Kanha solves this problem in RaDev's life.................