I think it is also about not getting enough support from the other end. Wahab is too wayward and inconsistent, pace alone is not enough
It is a fact that fast bowlers bowl well in pairs. Amir was more threatening and effective when Asif was bowling from the other end…same with the two Ws, Imran-Sarfraz, Lillee-Thompson, Windies quartet of the 70s and 80s, Ambrose-Walsh, Donald-Pollock, McGrath-Lee, Broad-Anderson etc.
Hope he is back to his best against the Windies and esp. in Australia