Schools and university's are growing and expanding in the early 16th century. Many people had more than one job, like the actor/dentist Joseph Anton Stranitzky for instance. It is important to be mindful of the multi-tasking and multi-talented - ness of these people. Don Garcia, for example, is (or was rather) a student we must keep in mind that even though it does not specifically say so in the script he almost certainly has done some extensive work in other areas.
According to http://www.answers.com/topic/joseph-anton-stranitzky, Stranitzky "was at first an itinerant actor, active in Nuremberg and Augsburg." He then moved into the area of directing and directed at the Kärtnertortheater company for the remainder of his life. He wrote himself into many of his plays that were based on classical Mythology. He often played the comic part of Hanswurst. Oh yeah and he was a qualified dentist in his spare time.