if sobers and kallis are the best batting allrounders, then miller, botham and imran should be the top candidates for the bowling allrounder title. never considered imran's batting and miller's bowling to be of world beating standards. but their bowling and batting, respectively, place them automatically in contention, with their weaker suits still good enough to earn them a place in their teams. imran, with zero wickets, and Miller, with a batting avg of 5 could still have played for their countries, I agree. but pound for pound imran as a batsman and miller as a bowler were only as good as kallis the bowler.
botham is probably the only guy in the history of the game to have such stellar records in bowling (world ecordd haul) and batting (14 centuries) and should be the most "true all rounder".
For the question asked in the thread, I will go for miller, imran and hadlee in that order.