We know the second challenge, can this be the third challenge?

So, we all know the second challenge and according to a new spoiler we also already know the outcome (we could have guessed anyway). Now, what do you think will be the third challenge?

Zain gave his third divorce and decided to marry Sanam. Can it be that his third challenge will be that of seeing how Zain will behave if she decides to marry Rehan in real? I have this weird feeling that this third challenge will be somehow related to Rehan, kids and marriage...It is likely that Zain will pass this third one too and that's when I will hopefully find out how the CVs plan to unite Aliyah and Zain islamically.

What are your thoughts? Do share. :)