Everything was created by Shehnaz with her over confidence that no man can ignore her. Yes she needs attention, everyone needs attention but it's her overconfidence of her attraction that complicated the situation that these 4 are now.
In the 2nd week (Probably) in that connections task; Sana was facing Mahira to convince Paras why he should choose her. Sana was over confident that Paras will choose her over Mahira & played a very risky game, if Paras would choose her, she would have an open option of having atleast one more part time attention giver, so she could control both through emotional blackmailing yet could maintain a good moral ground that she told Paras during that task "I can't be 100% loyal to one". But as VG rightly analyzed paras that "He's Very Sorted", paras didn't even take one sec to decide, about what should be his choice of connection. He chose Mahira and they are loved amongst viewers as the most loyal couple in BB 13. đ
Shehnaz loves Paras so she couldn't forget that rejection; Having no chance to rectify She went to Shukla but started coming to paras too, Paras also started giving side attention to Sana for the game, since Sana was with Shukla, She became a valuable asset for Paras. May be his attention for Sana also disturbed Shukla & could have created difference between Sid & Asim too. But after Paras became friends with Sid, Paras stopped giving undue attention to Sana bcoz he knows that might hurt Sid/Mahira
Everything was going on fine & balanced despite occasional slips from Sana but I think Sana lost it this week. She over played her captaincy Nautanki to disturb Mahira & even may be to break PaHira. Bcoz She felt emboldened by almost official recognition of SidNaaz from BB. So she though she could stretch her Nautanki much more. it did disturb Mahira but it hurt Shukla (Male Ego) more than Mahira & also more than Sana thought it would. She stretched it too much yesterday and she didn't have control over her words too. Shukla is seriously hurt. This is no show off from him. đ
May be SidNaaz will get back once more or May be not. If Not, then this might become a serious concern for PaHira. But this time That might even be difficult Sana, considering the strong bond between PaHira. Might ultimately force a major shake up in the grouping. Everything depending on Sana's strategy if Sid doesn't make up with Sana. đ
Either way, SidNaaz & PaHira Complex will rule the emotion & drama aspects of the show.