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I don't know how fangraphs determines low, medium, and high leverage, but Brandon Morrow's homerun rate in his career is 50% higher in high and medium leverage situations than it is in low leverage situations. It doesn't appear to be an in the stretch problem either, because his homerun rates with the bases empty, men on base, or men in scoring position are all similar.
I never believed the accusations that Brandon was soft, I just thought he was erratic due to lack of experience and the need of a well defined role. But the numbers are not good support for my opinion...