For the millionth time, and for anyone who is terrified with the thought of the Rams running a different system...
It's about having a great teacher at the OC position. Martz installed a massive playbook with significant changes in running the same plays from different formations in one offseason. Kelly went to Philly and installed his system which was radically different in one offseason with a playoff team as the result. Fish just needs to hire the right guy.
As to the system, I do hope he considers the Kelly/Ducks tree of offensive minds by interviewing Frost. I love the way they run the ball while they spread the defense out in the passing game. IMO that is the future of offensive football in the NFL.