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Weaver is the UP scenario. He dominated right off the bat in the minors and his AA stint could be blamed for fatigue. The next season he dominated AAA and was immediately effective in the MLB rotation with elite command+deception.
Cole Hamels was a completely different scenario. Minor leaguers simply could not handle his game. He was embarrassing hitters in 2006 (AAA 14+ K/9, 36 K/BB, 0 XBHs). If Hultzen is Hamels, we'll find out very quickly early next season.