it was clear from the wkv that sid is the one losing with shehnaaz drifting away from him
the hints were clear:
1. sana getting caller of the week bashing her for being upset with sid
2. she getting salman's attention again, sid might have thought that by salman's warning of sid to be careful of sana, and that drama of asana with salman she will not get same attention now on
3. even in luxury budget task she was central figure, the housemates had to guess about her, so clearly she is still loved outside
4. in the task, the 3rd option was always, 'rashami se apna dukhada royegi', that means whenever she is unhappy rashami consoles & cheers her, so if sana moves away from sid, rashami gains sana, so sid's loss is rashami's gain, and as per sid rashami is top contendor so he will not let her have sana as another ally after asim