It's a fair question to be honest, but I have only come to this conclusion again based off of the last 2 games or so with my New Orleans. I feel like the 2-3 zone works well for that team and it would take a bit for the team to learn a new defense. I probably wouldn't have run FCP with New Orleans had it not already been in place when I took over, but I am a fan and believe in the magic of FCP.