Bas yehi theory hai, nothing else and yeh theory many had in their mind but just that noone says it openly 😆
Yes, I had this theory too but this was shot down by many because shehnaaz was finalised only 2-3 days before premier episode and she was abroad before that.
At best they would have met once before or Sid May have got info on Sana through Jay-Mahi-Ravi-Sargun and vice versa...