the ends and the single high saftey are the most important pieces in the 4-4 IMO, the coverage and lack of DB's leaves the 4-4 a lil light on the back end wich is why you gotta have ends that can cover, or you can just put your backers there so you have 6 backers on the field, if you got a slow or just not that good player at the single high saftey, it doesnt work you gotta have a dominator for this D to be successfull, ive run the 4-4 almost all year, and love it, its versatile and you can hide your heat pretty well. overall good D and good post jay!