Sulburan is okay, but Smith, Lotskar, and Cline all have ace potential and have done more at the minor league level.
How does Cline have more ace potential than Sulbaran? Cline had a 6.4K rate in the gulf coast. JCS was two levels up with a K rate close to 10. Granted that came with a couple other issues, but I can't help but think Cline's numbers would be MUCH less pretty had he been placed in Dayton right out of the gate.