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I think the issue is command, not stuff. His stuff is plenty enough for a lefty.
The command is just horrible...and I agree hes unlikely to be successful in the rotation this year. He has upside as a #3-4 in Safeco, but its anybody's guess as to whether he ever reaches it.
I personally want to see Jaku back in the rotation ASAP. Morrow can build up confidence in AAA until another spot opens up.