The point is he feels he and sana are very much secure as finalists.
And he has conveyed this to sana many many times.
Sana darling who has so much problem with this now has herself said during sid captaincy nomination task,that if she and mahira wld have been on stand ,sid wld have saved Mahira only cos she is weak. And that time sana didnt have any issues with sid kaa decision.
She and bagga had this convo in usud. It is just that now she hates pahira and is more insecure with sid that her thought process has changed
If Sid's confidence is shaken wrt to this ( Suppose makers do a fake eviction this week) and make it believable, only then will sid change his thought.
His thought process is simple. Both sana sid are anyways in top 5. So better to take his other friends there. And its aarti who he wants to take in finale apart from sana ,not pahira.
Even vikas understands that .