PAK won't have won a single Series - let me explain why.
In ENG, the series was lost for one bad day, other wise 2 Tests were won without Asiaf & Butt. Now, for that Old Traford one, margin is so large that, to alter it Asif had to do match figure like 12/151 - last time at his prime, he averaged close to 35 against ENG on far better bowling condition. At Birmingham, Cook's negative tactics gave PAK a scope to bail out a draw, which they failed - don't back a batsman with close to single digit average in UK to save that Test. ENG declared with 4 wickets at hand & 400+ ahead - may be Asif could have made it 400 ahead with zero wickets at hand .....
In NZ, at best & I stress on that imagination, it could have been 1-1; still tough to imagine for a side that had scores of 131, 172, 216 & 230 with that 230 being 8/40 or in last session. Don't think, Butt with his 30 average could have done anything better than Sami - by your own words, that 30 average was managed against a non existent Kiwi attack.
In AUS, at Gabba, it was more than PAK, CA's accountant managed that close match - business usual, Smith could have enforced follow on with in an hour of Day 3, when his pacers were fresh & the wicket was faster - it's more like an innings & 39 runs defeat. Based on you logic, Butt has done hardly anything outside the best batting wicket in AUS, that's SCG. I give you the other one, for the sake of argument - at 10/120 from Asif could have made the match close enough for a genuine 39 gap with 20-20 wickets down. Least said about MCG is better & it's great for PAK that they haven't brought Asif - going by your logic from other end, 37 years old Asif with his 120KM line-length, would have gone at ODI rate, if not T20 here. Apart from first 5 overs, I don't think he is better than Imran now & I don't see him making AUS 25/6 in those 5 overs.