The reality is that if you are talking man to man, the differences are just subtle...
That is what I am talking about

Lets take the way I run my 5-3 double eagle vs trips
We can man up in C zero
-----------------------------------Q---H
-------------------------------------------------------R--------Z
-------Y------------------O--O--X--O--O-------------------------------X
------------------------E----T---N----T----E-----------------------------
------C-------------------B-------------M-----------B-------------------C
----------------------------------------------------------------S
OR
We can play cOV 3 IN A 1/4, 1/4, 1/2
-----------------------------------Q---H
-------------------------------------------------------R--------Z
-------Y------------------O--O--X--O--O-------------------------------X
------------------------E----T---N----T----E-----------------------------
---------------------B----------- M----------------------------B-----------
-------C--------------------------------------------S-----------------------C
The adjustments can be done without jumping out of the 5 man front. As I mentioned, the less moving parts the more a defense will play with aggressive nature.
Complex = BAD.
Simple = Good.
LOL.
Hey, you got to give me props on the fact that I don't like to budge from my caveman football thinking.