That's because great players generally play in more than 12 matches. Plenty of all-time great bowlers have averaged over 30 for one 12-match period. Variance. Just because two players have similar stats after 12 matches doesn't mean they're similar quality.
But you can show Swann's superiority statistically anyway. Batsmen average 37.10 in matches involving Swann and 32.66 in matches involving Hauritz. In other words, Swann's bowled on much, much more batsman-friendly pitches than Hauritz has, but they both come out with the same average. Something that anyone who's followed both their careers will know anyway, but it's good to show it in numbers.
Originally Posted by zaremba
The Filth have comfortably the better bowling. But the Gash have the batting. Might be quite good to watch.