how often does the "my guy" strategy workout?

[BakersBills]

weve seen coaches come in and clean out the roster but I cant think of any successful examples off the top of my head.

 

Chip kelly ruined philly

mcdermott destroyed a relatively good offense

jon gruden doing it in oakland

 

meanwhile belicheck,dungy, and even gruden won superbowls with someone elses "guys"