Disagree on Tolle. If he doesn't develop a second pitch, he has no future in MLB period. Major League hitters will destroy him. If he only develops a competent second pitch, he's a middle reliever at best. He's a long way from being a major league starter right now and will need another year if not 2 in the minors.
Early didn't have overpowering stuff as a kid and thus learned early (no pun intended) how to use pitch selection and control to set hitters up. Once he put on some weight, his fastball increased, but he still knows how to pitch. His ceiling is probably a #3 because he doesn't have a devastating first pitch, but he can be very successful.