Among the Colts' many casualties this week was Marlin Jackson, who tore his ACL in practice.  As you probably recall, Marlin tore his other ACL in practice last year.  Several athletes have gone on to have very successful careers after losing both ACLs, including one-man rebounding machine DeJuan Blair, but there aren't too many exceptions to the rule.  Given how much Marlin Jackson struggled to regain his pre-injury form, odds aren't good that he'll be one of the exceptions either.

Granted, Marlin can still go on to play a few more solid years of football, but odds are that those years won't be played in Indianapolis.  Marlin will be entering free agency this season and we all know the track record for players, especially defensive ones, entering free agency under Bill Polian: If you're not producing near or at Pro Bowl level, you better start packing your bags, because you will be replaced by someone younger, cheaper, and odds are, more talented than you.  We've seen it happen with Nick Harper, Marcus Washington, Jason David, David Thornton, Cato June, and a