i would definitely still apply to be a scico!
one of my friends was on the waiting list for a scico position last year and was asked to be a scico during the summer, suggesting that someone did drop out after the final decisions were made.
if things run the same way this year, your decision to leave the scicos shouldn't affect anyone else's chances.
it doesn't hurt to apply, so don't do anything you'll regret later on
applying to be a scico was one of the best decisions i made here at mac, so get your application in by midnight tonight!
p.s. i remember you from my ca interview! i wish you good luck to both positions