Another scenario could be that Shivaay will break ties with the senior Oberois. Perhaps resulting in leaving the OM. And maybe even to take along the whole young get-along-gang. But he will not tell the truth to Annika and the others. He will not want to ruin that picture for them.
He will research about Chutki though, his way to set things sort of right. And get NBS and Veer out of jail, realising their rage and hatred was explainable from their pov. His family including Annika will not understand this at all. Would he go that far to the extent that he would include Veer and Abhay in the Oberoi's family wealth?
Perhaps he will fear not only Annika could not handle the truth but also that she would leave him after knowing such harsh reality. I know they have a strong kind of love, but isn't it natural to feel not only anger but also fear and insecurity in such a case? And even selfishness could be a motive, because if she would leave him, he would understand but he would not be able to bear it... She had left him once, and it had he had turned into a man of stone..
Quite some possibilities. Curious to see what will happen next. I hope they present it to us nicely. Finally, the secret is out but they don't have to rush this completely.
If the younger Oberoi couples stay behind, it will give them a chance to stand out and intervene and get to the bottom of it. Especially Bhavya, with her police background she might be triggered to initiate investigation.