I agree that Eloy has to get it turned around for the Sox to reach their potential. I am not quite as optimistic on Vaughn. I believe he starts the year in AAA because Sheets hits lefthanded. Suddenly, he has a ton of competition in rightfield, first base, third base, and even second base from other right-handed hitters like Burger, Cespedes, Romy Gonzalez, Yolbert Sanchez, and by the second half of next year, possibly Jose Rodriguez. I think he has the highest upside of those guys, but I think he'll have to close some holes, especially against righthanders' sliders, at AAA.
As far as Robert, he hit .340. I am fine with him sticking pretty close to this approach.