Just an initial impressions, but wan't impressed with him in ST. Too small. Didn't care for the swing. Don't see the offensive skills/power translating to the majors. He's going to need to be really good defensively to make it as a starter imo. Even questionable then. I'd be considering Hays for CF next year at this point.
Haven't seen Mullins personally, so don't have much of an opinion. By #s alone, he's become more interesting to me. My understanding is his arm is below average, and range is just okay.
I do think Hays as the potential CF has some merit.