Pretty sure it was the drugs that messed up his promising career
Quote from Davey Johnson:
" I blame it on the drugs, and I also blame it on the delivery change they had him make. I don't even know where the orders came from, but they didn't come from me or Mel Stottlemyre. They wanted him to shorten his delivery, lower that big high leg kick and not turn as much. Sure, he could be run on, but they could run on [Greg] Maddux, too; did they change his delivery? To this day I regret even going along with it."
