Firstly, more than half of the characters are black, not even grey. So, having another good character can be quite interesting. Even Dr. Thakur and Akash seem to have something shoddy about them, Dev has been shown to be an all-around good guy...till now.
Secondly, his father's death, to which the younger Goenka family is hinted to be related to, could provide us a duo, both out to get revenge. Although, being a feminist, I want Durga to be the one to take her revenge, against someone as cunning and powerful and ruthless as the Goenka clan, the more, the merrier.
Lastly, it gives me some relief that Durga and Shaurya won't be turned into a couple! That would make the whole show worthless-Mulayam Singh Yadav style.