Quinn is 28 and played on 2 NBA teams this past season. I'm certain he is hoping to get a spot on a team this coming year, something that would be worth $1,939,350 to him (min salary for a 5-year veteran) to say nothing of the extra contribution to his NBA pension (likely to be several hundreds thousand dollars of income when he turns 50).
But, if Quinn doesn't find a NBA gig this coming season, the timing might work out really well for him to be available next summer when a new opening appears on the Duke bench.