The difference between the numbers against WI, NZ and Pak are minuscule. Australia were a stronger batting side but the numbers against the Saffers is interesting.
You can't be serious about sub-continental pitches being better for fast-bowlers than other pitches.
I'm not saying that pitches in Pakistan were green tops. But when I see that Kapil had average of 26 at home and 32 away and Srinath had avg of 26 at home and 33 away, it certainly intrigues me.
Even if difference is minuscule, since Pakistan were better batting side than most countries (at least in home conditions) and pitches were dead flat tracks, averages of bowlers shouldn't have been lower or ever close especially considering that it was not a familiar condition for the bowlers who always bowled on more bolwer friendly pitches.