Very succinct. In fact, Bills greatest contribution IMO was not even on the field, but in bringing back a focus to the organization. Bill helped Jerry realize that the team needed a clear gameplan regarding player acquisition and scheme development. It was actually after Bill left, that this vision became apparent_aggressive vertical passing game/power running (Garrett) & aggressive attacking 3-4 (Wade).
Actually Bill also did Jerry a favor by taking all his "guys" w/him to Miami. Otherwise, Jerry probably does not promote Ciskowski. I don't know about anyone else, but I take Ciskowski (a Jimmy guy) over Ireland & Bill every frikkin time. Ireland & Bill could not draft an OL to save their life. Thank God they hit on Witten (barely) otherwise they would have completely sucked w/their favorite position group too, TEs.
Now Dallas drafts & acquires "football players" instead of Bill's "guys". HUGE improvement.