The Saints as a whole value loyalty. There was really nothing screaming that Pete would not be at least competent as a play-caller, I mean it was PC that called plays in the 62-7 game against the Colts . In 2012 with SP gone the O did fine, not great but good. Now that was with DB @ QB. 22, QB play was below avg so I'm guessing that the loyalty thing came into play, so they went out and got DC. What the FO should have seen, and we don't know how much ML may have pushed to keep PC after 22. They should have known that PC is just not cut out to be an OC. He's just not a leader, beyond any play-calling duties. He's a play design analytical kind of guy and he's good at that