Typically, injuries, inconsistency, etc. mean that very few if any teams maintain a solid #5 starter. The goal though is always the same - to have as many quality pitchers in the rotation as possible. So while Correia's performance is not necessarily out of line for a 5th starter, the difference is that the Twins embraced his mediocrity knowingly, and for 2 years, rather than as a backup plan. He was really a $2 million/1 year swing guy that should start in the bullpen and move to the rotation only if higher upside options fall out for whatever reason(s). But the Twins miscast him as a reliable #4 starter, which he isn't.