And the Associative Property of Personnel Moves.

Sheldon Brown.  One of my favorite players on the team.  Gone.  His frank interviews and his gritty onfield play will be nearly impossible to replace, but this is the business of football.  Many fans are complaining that the Eagles didn't get enough for him, that the Eagles should have gotten at least a third round pick for him.

Statistically speaking, the argument can be made that Sheldon was the Eagles best cornerback last year.  This absolutely justifies the Eagles wanting at least a 3rd round pick for Sheldon.  If you believe ProFootballFocus's table linked above, Sheldon was worth far more than a 3rd round pick.  That's not what the Eagles got.  

If you agree with Tommy Lawlor, the Eagles got pick numbers 105 and 137 (4th and 5th round) for Sheldon and the Birds traded Gocong straight up for Hall.  Les Bowen on the other hand said 4th round pick and Hall for Brown and a fifth round pick for Chris.

In another formulation, Tommy says:

Sheldon = 105+137 and Gocong = Hall.  

Les on the other hand said:  

Sheldon = 105 + Hall and Gocong =137.  

The truth of the matter is that the trade was:  

Sheldon + Chris = 105 + Hall + 137.  

It doesn't matter where you put the parentheses. 

Looking at a couple  versions of the "Draft Value Chart", the Eagles got the equivalent of a mid to late 3rd round pick and Hall for Sheldon and Chris.  Is this enough for an aging, potentially disgruntled albeit excellent vet and a backup linebacker?  I'm not sure, but it seems fair to me.