See they can't make a promo in which lead is missing, so definitely there wouldn't be any promo of only Neil and Isha, Yuvika needs to be there. Bhoomi was not needed for sure but they want to highlight that the event made Yuvika all alone
About Isha becoming spoilt brat, yes that happened too very soon, and I understand your disappointment at it but her calling out NeiVika was very much normal, she was being called upon for being drunk, so she mentioned about NeiVika moving together at any part of the day. It's very normal and common, if anyone is blamed the person responds, you too do such things. Whataboutery howsoever uselesd, is the most common defense.
I don't know if Neil will save Isha or not, (I think he will cover her with a shawl) but the track is and will be about Yuvika
It's not Mahabharata It's the Mahabharata (or whatever It's version) from the POV of Yuvika/Yudhisthir so every event would be looked upon the implications on her


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