By that I don't mean in which level he should play, but in which position. Everybody knows that he was drafted as a SS in '09 but immediately transferred to the outfield as a pro. However I tend to think that this was actually due to certain conditions back then, that do not exist any more now.
When Fields was drafted the Tigers organization had Cale Iorg, Brent Dlugach, Audy Ciriaco and Danny Worth in the high minors and knocking on the door of the big club. With Scott Sizemore a lock to get the 2B of the future there seemed to be no place for Fields in the middle infield. At the same time behind Granderson there were only Casper Wells and Clete Thomas, but both were considered as better corner outfielders. So, obviously center field offered better opportunities for advancement.
18 months later Iorg still can't hit consistently, Worth is more of a utility guy than a regular, Dlugach is out of the organization and Ciriaco has moved to third base. And Sizemore's stock has fallen. Meanwhile the team is soaring with outfield talent. Brennan Boesch burst out of nowhere last year, Andy Dirks is tearing ST apart and Avisail Garcia is looking strong.
Therefore it seems that the situation of 2009 has been reversed and the Tigers might actually need Fields at the middle infield. He is considered by many as by far the best athlete in the system (even better than Jackson maybe?) and as a real 5-tool player. And he still is very young.
This however is just my theory or wishful thinking. I don't know what the team might think of him in the future. Hell I haven't even seen him play at all. I'd really like some info and thoughts by you guys who are closer to the team whether this could be done