Because Boley's toughness and effort could be severely questioned in 2008. He pouted that year, and turning around and committing $25 million with $11 million of it being guaranteed as a reward for someone that played with no heart is probably not a good standard you want to set.
I would have liked to keep Boley based on how good he was in 2006 and 2007 and hoping that '08 was an aberration, but I don't fault TD & Co. for passing on him because they thought otherwise.
The SAM linebacker isn't that important. He basically splits snaps with the nickel corner, who is more important due to his value in the passing game. I know I sound like a broken record, but if the Falcons want to make a significant improvement to their defense, they will focus on upgrading the MLB rather than the SAM linebacker.
My hope would have been that if the Falcons opted to go in a new direction at that position after this year, they could plug in Peterson there for a year and be able to get by, but Pete's play this year hasn't inspired with much confidence that would work. So I've turned my hopes to the possibility of getting London Fletcher to defect to Atlanta for a year or two until we can draft another MLB and/or Dent develops and proves TD to be a genius again.