I have reason to believe Arjun is & will always be good soul .
He will be biggest supporter of Adi & Zoya.
I know few people think that he might be negative but in Friday episode , When they come back from Bday party he said to Adi to calm him down
" bhai, Bhagwaan sab dekhata hai . Har andheri raat key bad savera..." . After than Adi marofied his dhasu 1 liner.."Krupaya yahan sab gyani hai..."
So Arjun who takes God's name cannot be bad...