why on earth would the Red Sox put Papelbon in the rotation?
1. Their bullpen is poor already, Foulke is a FA, and most of the rest of their relievers are old.
2. Their pitching staff is deep and already signed through next year - which is the reason they traded Arroyo in the first place.
3. Papelbon has been the best closer in baseball this year
4. Papelbon showed last year that he's dominant for about 5 innings and then gets tired and gets hit hard. Now, it is possible for him to gain stamina, but he's certainly not going to have improved his stamina after this year where he pitches 1 inning at a time.
Lester walks too many people to be worth much in fantasy leagues right now. After a few years when he gets his control improved, he'll be strong. But he'll still play in a very tough division, and in a park that's tough for lefties.
14-16 wins is optimstic, but even then, that still doesn't mean that Lester will have solid ERA/WHIP.
And Marte may have been seen as "expendable", but as a 21-year old in AAA, where he was much younger than his competition, he had a .900 OPS including a 1.3 K/BB and OBP that was .100 higher than his batting average, which is incredibly impressive. He was equally impressive the year before in AA, and while he has struggled this year, he's been much much better of late.
I would take Marte over Lester in any league.