Nice idea, but simply would not work, now, IMHO. Erickson was at a point in his career, where he was perfectly willing to defer to Kyle completely and take whatever role he was given. Urban, is far from that point, and the size of his ego would result in turmoil within our staff.
Not sure where he will end up, but if Urban is at SC next year (which now sounds unlikely), I worry that Scalley will be his defensive coordinator.