I somehow feel that Bani and Jai are working together. Afterall, they did the whole secret thing with Bernali and Jigs. Bani is a born detective๐๐, solving all the Mansion cases, why not this one? When Jai said he knows all of Bani's enemies inside and outside of the Mansion, I feel he knows something. He has men investigating every move each of them are making. When Karuna offered to help Sahil, it was only after she started working with Jai. Jai on the other hand, set Sahil up to feel that he was on his side and when his men asked him if he told Sahil that he will support him, he said yes, that's exactly what he wanted, Sahil to come to him rather than go to someone else. He did not support Sahil, instead he voted for Pushkar.
Some things look funny as though something is cooking on the backstove with Karuna, Jai, Bani, Adi, Raashi, Ranveer, Dadi and Massi. I think they are planning for Pia and Sahil.
Today Jai openly said he did not love Pia and was about to say something else but stopped, I feel Karuna told him what happened
If you look carefully, scenes between Jai/Bani, they are both communicating with their eyes, and when a decision is being made, Jai looks at Bani with approval eyes. I don't know if it's my imagination or I want it to be so, but I feel that's how they are communicating.
Also, Bani have not given up on Jai. If she did, she would not have extended her hand when he proposed. She still loves him and understands him