Obviously, the focus has shifted to run prevention. Just as obviously, Jason Bay is a better hitter than Mike Cameron, whatever the latter’s run prevention advantages.

But while I think it unlikely that Theo’s done tweaking the roster, I frankly don’t think the one we have right now is all that bad. It’s not the Yankee’s lineup, to be sure, but neither is it Seattle 2009 lineup.

Here’s Keith Law on our roster construction for next year:

Between the Lackey deal and the reported discussions with Mike Cameron, Boston’s front office appears to have changed its approach to roster construction away from the OBP/slug-heavy clubs around which they won two World Series toward run prevention through superior pitching and defense. We’ve already seen Boston sign Marco Scutaro, an above-average defensive shortstop who was even better than that before a heel injury ruined his 2009 season, in addition to paying heavily for Cuban teenage shortstop Jose Iglesias, a pair of moves they hope will secure the shortstop position for the next seven or eight years.

And here’s Buster Olney on the same subject, today:

The Red Sox have tried to sign Adrian Beltre — widely regarded by talent evaluators as the best third baseman in the majors — but they may not be successful in reaching the middle ground between what they want to pay Beltre and what agent Scott Boras is asking for (an eight-figure annual salary). If they can’t get a Beltre deal done, they will go with Casey Kotchman at first base and Kevin Youkilis at third. Either way, the Red Sox will be in position to fight it out with the Mariners about who has the best pitching-and-defense team in the majors. A rotation of Jon Lester, Josh Beckett, Lackey, Daisuke Matsuzaka and Clay Buchholz could be backed by an infield of Kevin Youkilis, Dustin Pedroia, Marco Scutaro and Beltre (or Kotchman), and an outfield of Cameron, Jacoby Ellsbury and J.D. Drew.

Conversely, the Boston lineup could have the least amount of impact we’ve seen in Theo Epstein’s time as general manager. The Red Sox have posted the following team OPS marks over the past seven seasons, starting in 2003: .851, .832, .811, .786, .806, .805, .806.

These are the OPS numbers of 2009 for what the Red Sox lineup might look like:

SS Scutaro — .788
2B Pedroia — .819
1B Youkilis — .961
C Martinez — .861
RF Drew — .912
LF Cameron — .794
DH Ortiz — .794
3B Beltre — .683 (or Kotchman, .721)
CF Ellsbury — .770

It’s possible that the lineup would be pretty good — if Drew stays healthy, if Cameron continues to be productive at age 37, if Ortiz hits more consistently than he did in the first half of 2009. Keep in mind that the Red Sox (and other big-market teams) always will have flexibility to go out and make in-season deals. Are the Red Sox as good as the Yankees, in the aftermath of the Lackey and Cameron agreements?

Maybe not.

It seems fairly clear, though, with more moves to come, that Boston is one of the four best teams in the AL, with a couple of months to go in the offseason.

Olney, probably for the sake of convenience, ignores the possibility of platoons. But given that folks that will be penciled into the lineup next year have rather pronounced splits, I thought I’d take a quick look at the roster possibilities. Obviously I am not assuming a Beltre acquisition, but have anticipated the signing of Cameron and the acqusition of Max Ramirez for Lowell. A couple of other notes: one, the lineups are obviously unrealistic, because Tito is highly unlikely to platoon his regulars this heavily. Two, we have sample size problems, most obviously with Lowrie and Ramirez. Third, these numbers are career, not last year, so they do not reflect recent declines – or improvements, for that matter – in player performance. Last, the batting order has been given essentially zero thought.

All that being said, I think the roster, even without (likely) further additions, is both flexible and adequate. Unless Ortiz returns to his former level, it’s not going to be a scary offense, it lacks pop and we’re not stellar against lefties, but we should score runs. Again: this is even if we do nothing else. So let’s not all panic about the presumed loss of Bay just yet, shall we?

More on the signings and the front office’s plan later.