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Langston never had arm trouble except for a brief DL stint in 1985. He was inconsistent with his command the first few years as well. But he had a rubber arm...could handle 250 inning seasons without flinching etc. I'd say he came of age around 26...which is coincidentally how old RRS is now. ut yes...stuff-wise, they were pretty similar. Langston, fastball had more Pettitte-style cut on it and was thrown 93 instead of 90, but he had a much flatter breaking ball and no change-up.
The Mark Langston career totals:
2962 IP, 108 career ERA+ (112 career DNRA+), and 2400 Ks to 1200 BBs might not be a bad upside projection for RRS.