I agree with the video. Too many people put the shotgun on the back burner and never train with it. They get so caught up with their Glocks and AR15's that shooting and moving with a shotgun, reloading, and working through malfunctions looks like a scene from the keystone cops.
I am no expert myself but I am definitely addressing my shotgun weakness's by getting out there with my shotguns more today than ever before in my life. Zombies are comming soon ya know!