If Langer averages 26 against Ajarkar and you call that a bunny how do you rate Vaughan who only averages 9 against McGrath, do you call him super bunny.
what you 'average' against a bowler is an irrelevant statistic in this argument.
What the 'average' shows is the average of the scores from the dismissals for the said bowler.
Ie,say you score 120,4,4,340,144,220* against a full strength Australia involving all the bowlers. But McGrath dismisses you in the 2nd and 3rd game only.
Then your 'average' against McGrath is: (4+4)/2 = 4.00
(since its the scores you were dismissed at by McGrath/# of dismissals by McGrath for example).
This 'average against bowler' is made irrelevant in case of who's someone's bunny and who isnt.
And Vaughan is a classic example.
He has played one series vs AUS and in the 4 matches that Pidge played in, Vaughan scores:
33,0,177,41,34,9,11,145.
McGrath scalped him for 33,0,34 and 11, while getting clobbered for 2 tons along the way.....thats not a bunny....
being a Career bunny against someone is Atherton vs McGrath,Atherton vs Ambrose, Mark Waugh vs Ambrose, Cullinan vs Warne,Hick vs Ambrose etc etc.
Career bunny means you've dominated them once-in-a-blue-moon and got hammered by them far more often than you dominated them.
You sometimes see series bunny like Laxman being Warne's bunny last series( He hammered warne in 2001), Lara in 2001 vs McGrath, etc etc.
Thats why McGrath is still playing because he has a bunny in Vaughan and thats why Ajarkar is not playing because he has no bunny.
you play because you are good enough to get into the playing XI. not because if you have a bunny or not. The WI of the 80s had a few bowlers who could make a bunny outta 90% of the world batsmen but didnt play because there were four better bowlers than them.