Actually BSN, your statement is utterly and absolutely incorrect.
Here's why:
After a 2009 in which Papelbon lost the "feel" for his splitter, (which can happen for long periods of time, just ask Jose Contreras), he had his lower percentage of fastballs and highest percentage of breaking balls and splitters thrown career-wise.
Check out the difference:
2009:
FB%: 81.5, SL%: 9.2, SF%: 9.4%
2010:
FB%: 69.5% (career-low), SL%: 9..3% (career-best since becoming a closer), SF: 21.2% (Career best).
Disclaimer: There are an amount of pitches deemed unrecognizable by the system, and these pitches comprise the difference between the actual percentage and the amount needed to reach 100%.
As you can see, last year, he threw more breaking balls than ever before, but the velocity in his fastball, while still there, doesn't represent the same challenge when it doesn't have any movement, and couple that with a splitter that hitters are laying off more than ever, is a recipe for disaster when it comes to Papelbon.