When the crowds are light, they usually don't do FP for Buzz. In 2013, 2014, and even into 2015, I never saw FP for Buzz. But then in the summer and during busy Veteran's Day week of 2015, they took over a few of the Star Tour's kiosks. I'm guessing they use convert them during the busy times. But when crowds are light, Buzz is usually a 5-15 minute wait, so it doesn't need the FP. That's my theory, anyway.