The sense I get from JY53's posts and from many other is that Morris still ran the defense that Staley ran (which as I understand it is the Fangio defense) but they may have called the defense differently.
By that I mean ... suppose the Fangio 'book' has 100 variations documented. On any given play Staley might make one call while Morris could make a different call - two different pages from the same book that result in the D looking different. To me that allows for it to be considered the same defense but at the same time accounting for the D under Morris looking different in certain specific ways than the D under Staley.
AlbaNY_Ram