the prospect rule is anyone who retains rookie eligibility. Rookie eligibility is 40 IP or 130 AB, or 45 days in the majors during the 25 man roster period, IIRC.
Garcia should still be rookie eligible and therefore a prospect. he's only had 12.2 IP in the majors and 31 days per Cots going into the year. Looks like his 60 day DL is dated from 3/22/13 this year (
link), so he is still a rookie as best as I can tell.