I am putting this out here as more of an interesting thing to look at vs an actual outright recommendation. But let's take a close look at the man they call Clay.
In 2010, Clay put up a 3.8WAR and a 3.61FIP en route to winning 17 games. But, he threw only 173IP after missing 4-5 starts with a hamstring issue.
In 2011, Clay had a 1.1WAR in 82.2IP with a 4.28FIP. He missed 20 starts with a spinal fracture
In 2012, Clay has a 1.4WAR and a 4.44FIP in 131.2IP after missing 3 starts with esophagitis.
Now, nobody can say that Clay hasnt been awesome since his return from his esophageal issue. But nobody would claim that Clay is an iron man either and you really cannot be certain that Clay wont post similar numbers to this season on the whole. His 2010 was pretty lucky, in that his ERA was 1.71 runs lower than his xFIP. Last yr, his ERA was .75 runs lower than his xFIP and this yr, he is only 0.2 lower. Even with his amazingly bad start and his amazingly good run of late, the low 4ERA pitcher he is on the whole seems to be who he really is. But, if he finishes the yr on this tear and sees his ERA drop into the mid 3's, might they get more value in return for him than they are getting out of his production.
I was wrong in an earlier post on Clay's contract. He's signed through 2015 with 2 option yrs. But he gets pricey in 2015 when his contract jumps from 7.7 mil to 12 mil. Then in 2016, his AAV jumps from 6 mil to 13 mil as they would have to pick up his option. So, he wont exactly be a bargain after 2014. But, he would be a steal for 2013 and 2014. The sox could use those extra years and his recent performance to get an actual durable innings eater in a deal.