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Actually, Mark Langston's curve was very similar to RRS' now. It was just a bit quicker, as I recall, but same basic shape.
Add 2 mph to RRS's heater ... take AWAY the change ... give him a Mark Lowe mask :- ) and you've GOT Mark Langston.
Langston used to lead the AL in strikeouts, of course, pre-offensive-explosion. He was a hot pitcher when he was young. Leapfrogged AAA to lead the league in K's as a rookie, and often finished top-10 in ERA despite pitching in the Dome.