Dave Cameron at Fangraphs:
"I would like to make a plea with anyone who plans on writing anything about how a team’s off-season has gone – please, please, please do not treat 2009 as a constant."
Decent advise assuming you have other tools and indicators to help understand what affects performance. With baseball moving towards defense, ask yourself if a team has added better defensive players when trying to predict pitching improvement.
Of course, there is so little data to make projections that one must use the previous season production as a foundation. By little data, I mean seasons as sample size.
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