It was assumed by some that he wanted nothing to do with a rebuilding effort. The fact that he is signing with a team that is going to be starting a rookie QB doesn't lend itself to that theory.
It was assumed by some that he wanted to go to a team with warmer weather. That apparently isn't the case either.
Really, now, the only thing left to see is how much the Redskins will be paying him. If it is more than the 5-year, $35 million that the Colts offered (as has been reported by ESPN and other places) then we know it was about the money. If it is less than that then we know that he just didn't want to be with the Colts.