My feeling: he is here to bring toxicity in mandli, shiv and Stan being broken, leaving Nimrat and Sajid on the other side.
It seems Sajid will rope in Prinynka and Shalin, and next person to evict from Mandli will be either Shiv or Stan. This way BB will keep Nimrat and Sajid in the game.
Nimrat is right, Abdu is giving her cold vibes and same to Sajid.
BB will kill many birds with one Abdu.