The 3 man front last year. Thus year they're right back to 4 and committing fully to it. Tyler Batty ain't gonna out there to occupy blockers. Also even a man front didn't always mean that. Bronson had an amazing season as a 3-4 end. And Ziggy was there as a pass rusher too.
There's not a chance he's legitimately blaming anything on the scheme. They already started fall camp with the defensive focus known when he decided to leave. IOW he was already getting passed up while being out with injury, among likely off field questions.