Check out the list's reason for Joseph:
2012 salary: $9.75 million Terrific last season, but the corner drafted in the first round in 2006 has started a full 16-game season once (2009) and been named All-Pro once (2011).
The fact that he was named all-pro/pro-bowler last season with the Texans speaks to how valuable he is to this team.
I can't exactly remember his injury situation last year, but I don't recall a game that he missed due to injury. Perhaps he sat out in the last game of the season? Still, he played in 15 regular season games last year.
Whoever picked Joseph for the list did so without any context.