I'm seriously willing to go out on a limb to say Choo has an exemption left. Prospects will be cap-exempt for three years. A year is a season in which a player has 50 or more plate appearances, 5 pitching starts, or 10 total appearances. Since 2 of his years do not meet the exemption loss requirements, he has to have one left. It's been asked before and that was the ruling, so I'll throw my ass out there on this one if I'm wrong.