Yes, Vishaka's presence at PB, however odd and unpleasant for daadi, is most crucial ... She's the only one from both sides of the spectrum to set things straight ... for Dev's well wishers as well as for mircha gang, vaish, and last but not the least ... amma ... esp during mehandi rasam ... She's also the only person who knows everyone's intentions ... good, bad, ugly ...
The only two most important people who carry the torch of entire show at PB .... are daadi and dev ... And Vishaka is going to have to shoulder the heavy responsibility of proving her well-meaning intentions to them .... esp to daadi ... Her role tomorrow is going to have to be very formidable one, coz she also knows the strong bond between daadi and dev .. And she has to make herself powerful enough to stand firm and face daadi, with all her wrath and anger, interrogations .... Here, somehow I feel that Dev may side and support Vish, as he already witnessed the changed Vishaka in Vrindavn ...
I even look at Vishaka as radhika's well-wishing-representative when she makes a promise to herself, when hugging ex-saasu tue 10/27, part 6, that she wont let anyone snatch radhika's rights from her ... (To iss liye aap log aaye hain .... ye hai aapke mann mein .. par main aapke iraade qaamyaab kabhi nahin hone doongi ... kisiko bhi radhika se uska haq nahin chhinane doongi ... rem?)
BTW, it's not clear if babuji is going to go to PB or not ... he still hasn't quite reconciled with beti vishaka ... and may possibly have another priestly duty in Buxor .... or somewhere else ....
Lot of speculations .... so will just have to wait and see ...
~ P ~