Yes, this does seem to be the common belief. I have personally purchased or acquired most of my breeder size females as adults. I have had 3 produce the same year I acquired them Though I got 2 of them early in the year so they may have just had time to acclimate. the other one was just a huge virgin pet that i got from my local reptile store and was locking up in a couple months from when I got her. So yes it is possible but I personally would not bet on it, but that would not keep me from trying
As for the '08 I would personally wait until the '10-'11 season