First article I remember on that was Baseball Prospectus marvelling at the 100-44 crew, and running a study on synergy. Especially the idea that a pitcher could get tired when facing a stacked lineup. In that one they did find an effect, or thought they did, which would be an anti-sabermetric attitude on a sabe's emotional level.
It would be almost impossible to isolate the variables, wouldn't it? If Roberto Alomar, Jim Thome and Albert Belle CAUSED a better season for Sandy Alomar Jr. (or didn't), the 'study' would indicate that Alomar helped Thome. You'd get feedback loops and it would be hard to sort out whether Alomar Jr. had been drinking orange juice that offseason or benefitted from stressed pitching.
Seems obvious to me, in any sport, that CONSTANT PRESSURE is desirable. The Seahawks just scored 36 points in a second half ...