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Only responding to the Hamels/Santana comps. Both those guys average over 92mph on their four-seams (the early year data doesn't seperate two-seams for Hamels which he doesn't thow anymore). Santana threw his four-seamer over 93mph in his prime.
Hultzen late season four seam would average 90-91mph. If he had a Santana/Hamels class changeup, his Ks wouldn't have dropped so hard in the 2nd half. He needs that velocity.