We know Manny is going to hit, Ellsbury is going to run and patrol the field, Tek is going to call great games, and Lowell, when he's back, will put balls on the Monster and grab them up at third. We know that Paps will close out 90+% of the games he's in, Beckett will win 17+, and Okie and Delcarmen will hold down the pen, but I think a healthy Sean Casey is everything that the Red Sox need this year.
We've seen Youk break down toward the end of the past two seasons and early this season it's clear that Papi isn't recovered from his surgery, so I think if Casey is swinging the bat anywhere near this well and staying healthy, we need him to put in a few games a week at first and let him spend some time at DH. I think it might be a good idea to make a plattoon with Papi and Casey rotating at DH and Casey and Youk rotating at first. When Lowell is back, we need two of Papi, Youk and Casey in our lineup every day, with the third getting some rest.
Casey's bat needs to stay in the lineup and Papi and Youk need to be playing well in early-to-mid Fall, not late-Spring. If Casey can spell Papi and Youk for a couple hundred at bats and innings in the field, all three of them can be fresh for the stretch run and the playoffs.
As far as the MVP comment, if he can keep Youk hitting in the .300s into the playoffs, and let Papi get healthy so he swings the bat well late in the season, he's opening up two of our top 5 hitters. That's pretty valuable. Everyone else will do what they do, but Casey's production will reap benefits threefold of everyone elses because it's giving Youk and Papi the chance to get fresh and stay fresh.