When the Red Sox signed back-up first baseman/outfielder Brad Wilkerson to a minor league contract, it drew little attention.

But now that Mark Kotsay has undergone arthroscopic back surgery, the Wilkerson deal looks solid.

Just another insurance policy for Theo Epstein.

Wilkerson, 31, has had some good years (.255, 32 HR with the Expos in 2004) but has been on the downslide. But, as a back-up to the back-up, he will do. Kotsay could be back by May.

What other insurance measures has Epstein taken.

The starting rotation numbers 5, PLUS John Smoltz, when he is ready. And there are Clay Buchholz and Michael Bowden in the Triple-A wings.

The bullpen looks set. But can you guarantee the health of 7 pitchers? Takashi Saito turns 39 next weekend. Hideki Okajima is 33.

Beyond the 7 there is Wes Littleton (picked up in a minor trade) and Miguel Gonzalez (a Rule V pick who will have to make the roster or be returned).

And don't forget that Sea Dogs closer Daniel Bard will likely see the majors this year. Lefty Hunter Jones is also a possibility.

For catcher, the Red Sox have Jason Varitek and Josh Bard. If either comes up ailing in spring training, George Kottaras is there, and Dusty Brown right behind.

In the infield, there is depth at shortstop with Julio Lugo and Jed Lowrie, with some journeymen in Triple-A, and Argenis Diaz in Portland.

In the outfield, Jeff Bailey, Chris Carter and Jonathan Van Every are all 40-man roster guys in Pawtucket. Down the road, Boston may look to Zach Daeges and Josh Reddick.

Depth. It's a good thing.

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