Tamsach: If I made eagle at Kiawah 11 is valid while playing Kiawah and not playing Best of Par5,
O yes it is - it will count to your eagles award.
Concerning the headline, Bo4 do count to the average (at least, the old one did).
Bo5 would not count much because it's difficult to come down far enough - did you ever play your average, 62, there?
Bo3 would be worse than red tee tourneys, dropping the average to 34 or something.
This decision is well thought-out.