First, no clue why you are going with WAR, that is not used to determine how much a player gets in arbitration or how much the player will get in FA.
No, but it's been proven to be a fairly good guideline.
There are plenty of reasons why McCutchen would not have a WAR of 7.1, injury is only one reason. Also, you are giving McCutchen and additional 2/3 of a season, so he would really need to have a WAR of 10.6 in 2012.
If you want to dismiss McCutchen's 2009 season, when he only played 2/3 of the season in Pittsburgh, fine. In that case, he'd only need 5.6 WAR in 2012, to average 5 WAR/year. You can't dismiss his 2009 WAR, then count it as a season played.
I said these guys were all similar hitters at the same age. You must have missed that.
If you're really comparing Andrew McCutchen to Adam Jones, Corey Patterson, and Rocco Baldelli, then I guess you don't think the Pirates should sign McCutchen to a multi-year deal. And you're wondering what this whole thread is about.
Jones is considered a terrible OF, so his WAR is killed because of it. I doubt he is getting paid less because of it.
Absolutely Jones' fielding gets considered, when the O's determine what to offer him in 2012 (his arb2 season). His fielding, the fact that he's not much of a base stealer (12 SBs is his career high, last year), and his .319 career OBP - they all are a factor.