I think the Gffur card is the only thing which will force Zoya to stay in SM. As all eagerly wan to come out of the mess, and tanveer is the only person who can spill out the bean that Gaffur is Zoya's father. Now she can tell this thing to Zoya for her own benefit.
This is the only reason for her comeback in the show, if she tells Asad that Imran is the father of her baby, then he will bring Najma back home, he wont let her stay with the cheater anymore, he will never marry tannu to save najma marriage. This track has no sense.
Now it will be good to see how Tanvir force Zoya to stay and Razia force her to go out, now Zoya will again be a shuttlecock between tanvir and Razia.
But I think this time even if Tanvir will say that Gaffur is her father, Zoya might not believe her, and she will go back to Asad and they will find the truth and I think that will lead to brother conflict.
Even surbhi has already told that this accidental marriage is one of the twist, from the major twist which is coming.
For a time being I am not worrying and panicking about janu track, as m thinking the above mention gonna happen.