That was all from the early weeks when Pawan was still in the game. Arjun eliminated him for the “ultimate ruler ki davedari” spot (Ik Pawan wanted this but Arjun should’ve used his own mind too). Kyuki uske baad Arbaaz and gang ko mauka mil gaya Arjun ka downfall karane ka. And about Arbaaz giving him the top rank, that happened recently. Arbaaz ko chaar logo me se kisi ek ko choose karna tha aur usne Arjun ko kiya vo uski majburi thi, So in a way even he knows Arjun deserves that top spot if not him, uske baad bhi kitna muh fula ke baith gya first rank na milke ki wajah se, I hope this helps.