The Rodgers deal will have a lot to do with how they structure it, cap-wise. Aaron doesn't want to play for a loser, I can assure you. That means coming up with a lot of cash and spreading it over the length of the contract--and the length makes it more/less flexible--though you typically have to take a big cap hit somewhere. That's basically what they did with Brady. I think TT sees the opportunity for that hit as now, before they have to make offers to Raji and Matthews (for 2014). But I'm just speculating. Look for a big payout/hit this coming season which will ease off in the near future. For Aaron, it's really more about stability and guaranteed money.
On a trivial side note, speaking of long-term contracts, I read the other day that Bobby Bonilla (remember him?) is still the highest paid Mets outfielder (retired since 2001).