Instead of defending at an elite level, Avery should have been "saving his energy" for offense because he's being under-appreciated here.
Avery's already an elite defensive player, has become a solid mid range shooter and rebounder for his position, is inching closer to league average as a 3 Pt shooter, has seen steady improvement every year in the league... and he's still just 23 years old...
If the Suns can start a successful undersized back court, why can't the Celtics?
He's going to command a contract valued at $5-8M per unless his injury history scares potential suitors away (doubtful... but it could hurt the length/$ of the contract). He's going to be worth it, especially to a playoff team (ala Tony Allen).
Avery can be a long term solution at SG, if the main concerns for the team are addressed (rim protecting C and elite scorer). The main concern being that Avery's game might not be built for 30 MPG consistently, but if he continues to get stronger and adjusts his game, he can definitely become a Starting caliber player on a contender.
Danny should match anything up to 4 years/$24M... even 4/$28M shouldn't be out of the discussion. People around here are devaluing Avery as a player, his work ethic/development and potential.