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Lincecum's decline really highlights pitcher risk, even in the case of guys with very safe arm motions.
Both Timmy and Felix are guys with great mechanics and no real injury history, but no young pitcher is immune to losing their fastballs. Both were guys I would have bet strongly on a couple years ago, and now both are in decline. They're healthy, but just not quite what they used to be.
The upcoming trio of Ms prospect are all a bit risky from an injury standpoint (Walker in particular), but even healthy pitchers seem to have a short prime.
Milk the prime, then sell the guys a year early rather that a year late?