They are different issues though. The positional change is one thing, the Red Sox paying him is another.
I get the impression that the possibility of Ellsbury staying is a lot more real than most of us think. I don't think he'll ever post 20 HR's again, and if he posts a .300/.360/.450 line with 15 HR's and 40+ SB, he probably won't be able to parlay those numbers into a contract significantly bigger than the one Michael Bourn got, allowing the Sox to be players for him. 2011 is long gone. What matters is what he does in 2013.
Whoever says the Sox (or anyone for that matter) should/would pay 20 per for Ellsbury needs to have their head examined.