I'd guess that he's suggesting that the guys who get a few awesome flights in at the beginning of the TOD - then fly "attack" the rest of the month - not show in the rankings.
I don't care either way (personally).
One of the few useful things about how it is now is that if you are a fighter pilot that does a single milk run in the other categories, you can sometimes wrest the carrier away from some dope who wants to beach it under the shore battery before it gets sunk.
<S>