Did David take the money and run?

He got his pay day and he returns with this play? Missed tackle after missed tackle.  Being out of posistion and of course we have the dropped ints.  For a LB making the kind of cash he is, he is not even coming close to earning it.  I can't recall a single splash by David so far this year. At least McCoy looks like he is at least trying to earn his money.  Is it him or the system?