He's got amazing stuff. We all saw it. He's gotta learn to pitch though. Glad to see him getting K numbers in AAA. Was easier in the lower levels for him to just overpower hitters.
It's the same as Giolito. Giolito's curve and fastball are both top-notch but hitters weren't biting on the curve because he doesn't throw either for a strike enough. Both will be really good down the line but they aren't ready yet.