Injuries are part of football, some teams are hit harder than others.. to me it looks cyclical and the luck of the draw.. there have been posts before by those who are adept at these things and shown where we are about in the middle of games not played by starters due to injury.. not the highest and not the lowest.
Do not confuse testiness with fact, do not confuse anecdotal evidence with long term results. I have never seen documented where the injury situation has anything to do with coaching, training or anything else, but football.. injuries are what they are, part of the NFL. For example Rodney, broke his shoulder on a very freak play and then had knee problems because of a cheap shot, neither was due to anything except football. Seau broke his arm, on and on..