The 2009 data is prorated to 150 games from fangraphs. As you can see in the total, the Sox were about 4 wins below average holding pitching constant. Fangraphs WAR totals actually saw the 09ers as an 82-83 win team and credits the pitching staff with ~23 WAR. That difference evaporates if your evaluation of, say, Jose Contreras' '09 production is dimmer than theirs.
The 2010 CHONE projections are the WAR150 of the projected starter with amended defensive projections, taking these two excellent projection sets into consideration. Pierre is in left, with DH presumably Kotsay and Jones. As larry has noted, Quentin's health is important in this design, so it may just be that Quentin will be eased into the DH role if he can't play as well in the field as Kotsay or Jones. This is presumably the sort of flexibility they're talking about when it comes to signing a DH who can pass in the field.