Genorb,
48 people is two rounds of knock out match play. After two rounds, 12 people will remain. Those twelve people are automatically in.
The other 4 are chosen by the Team Captain in an attempt to round out the team in a way that seems appropriate for the challenge.
We decided to go with having a knock out tournament to qualify because neither Mike nor I feel qualified to decide for all of WGT who is the best of the best.
We figure it's better to have an embarrassment of riches than to arbitrarily say player X gets to play, but player Y cannot.
I sent out about 60 invites based almost entirely on your top 100 list, but also made a couple of judgment calls - nothing major, but a couple of decisions that fell outside of a strictly average-based list.
I over-invited because there are always reasons why someone may not be able to participate, that's why it's limited to the first 48. Also because more than 48 would be unwieldy.
The Captain's picks serve an additional purpose too. If there is a glaring omission in the line up (like if BolloxInBruges somehow missed the cut on the Dev's side) then the captain has the ability to rectify that situation (if that's what he chooses to do).
It is certainly not my intent or Mike's intent to make waves, but to organize this event in the spirit with which it was intended. We may make some mistakes, but our hearts are in the right place.
I hope that answers your questions.