So I'll just use the Elf example (obv we are not talking about running rogue). For an Elf to get 70%+ of their thief OPs they would need more raw TPA than a Halfer (to get 70%+ through) correct? As you say Halfer has better def ability, they also have +10% pop. So if we assume that the t is equal surely this means Halfer has the edge over Elf in the a department? (Based on more raw numbers being available). Elves also run into stronger attackers this age.
Also if Halfer/WH is as bad as you say, why would KDs target them first? ;)