The spread has already worked in the NFL. The pats have been using it for a long time.
Spread yes, the spread option which is what he was talking about.
Being an HC isn't really about X's and O's. It is about organization, motivation and administration. I'm not sure experience helps all that much. Game management is part of the job and that ain't rocket science since any of us who play Madden know the drill on that. The last thing is the personality of the HC - will he try the odd onside kick, go for it on 4th and 1 at their 40 yard line. Those sorts of things which, again, aren't about experience. Caoches are either good or bad. I'm not sure doing the job matters all that much and for guys like Jimmy Johnson and John Gruden both of them sorta got worse the longer they did it - and really Dungy hit the wall in Tampa as well so there's something to say for a different way of doing things.