This is in no way pure speculation by Kent Somers. He has a direct quote form Graves
You're assuming, of course, that Rod wouldn't dream of blowing a little smoke...
But if Rod is leveling, consider this:
When you decide to sign a high profile free agent (particularly at RB) you are in most cases throwing a lot of money at a guy with a certain amount of tread worn from the tire.
You can't rely on being able to prorate your investment over several years and, in fact, run the risk that an injury in Year One could wipe out everything (i.e. at least when rookies or young players get injured, they'll still be relatively young by the time they are ready to play again).
Signing a expensive high-profile guy like Alexander, Lewis or James is scary business. Last year, I frankly thought they'd all bomb, but all three wound up with good years. But it would be just our luck that we'd sign one of them and it would turn out that "last year" was his last good year.
It's obviously frustrating to fans when the Cardinals seem to shy away from the top guys, but, in my opinion, they make the most sense for teams who feel they're only one player away from a championship. For us, the updside/downside ratio is likely to be too risky.