Look at this other example. A lot of people at times have suggested McGrath is the best fast-bowler of all-time given compared to Marshall, Hadlee, Imran, Donald, Ambrose. Due to the fact that McGrath had to bowl in a era of less bowler freindly decks, but rather on alot of roads, where boundaries have been shortened, more aggressive minded batsmen etc..
Now do you think the effectiveness of of Marshall, Hadlee, Imran, Donald, Ambrose would decrease or their averages would have been higher if they played in the 2000s era of flat decks?.
My position on that matter has always been, a great fast-bowler of any era who had the unique skills to dismiss batsmen in all conditions would have been just as effective as McGrath was this era.