re: Do the Saints need a new offensive line coach?

Yeah I don't get that either?

Blu I don't think any tears would be shed if he were to be let go.

Certainly a lot of factors are in the mix in sack totals and pressures:

How he interacts with the players on the line and how they respond to him.
What and how he is teaching the players.
The time he puts in reviewing the play of his guys and the upcoming opponent.
How well he works with Brees.
etc.

These are all factors only CSP knows and you hope he would pull the trigger IF he thought there was someone out there better to do the job.