I think I know what's the significance of Ab marrying Yu, it is to teach bhabhi lover the importance of marriage.
As a self-claimed Seer, I can already see the scene playing out:
(Ab & Yu at the mandap, the latter about to put sindoor in her maang and then comes Ar the bhabhi lover, grasping the wrist of Yu)
Ar: NAHIN, YEH SHAADI NAHIN HO SAKTA HAI!
MERI BIWI KA MAANG SIRF MERA! 
Ar to Ab: Maine tumhe tumhara maa ke samne tumhe sindoor aur mangalsutra dala tha - kaise tum isse Shaadi kar loge 
Meri patni, meri BIWI ho tum. Shaadi koi mazaak nahi
Chalo utho!
(And Ar the bhabhi lover takes his dealwali biwi away)
she is the hero and heroine of the show ! Abhira Sharma owns the show and she is rocking it. No one could have done justice to the character other than Sam. Such a talented and beautiful girl !




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