Conversations like this are why I really like the FV framework Fangraphs uses and try as much as possible to think about these guys in tiers.
IMO the top of our farm probably looks like this
55 Grade - Hartshorn
50 Grade - N/A
45+ Grade - Ayers, Conrad, Wiggins
45 Grade - Townsend, Kepley, Caple, maybe Wing, maybe Sorrell
I think Townsend is a tick behind that second tier of the farm, but also mindful of the fact that he's pretty liable to come out next April with like a 30/5 K/BB ratio in his first four starts and grab that #2 prospect mantle by the throat.