Here is how his offenses have done with him as OC in the NFL:
2009, Cleveland: 29th out of 32
2010, Cleveland: 31th
2011, Miami: 20th
2012, Kansas City: 32nd
2018, Buffalo Bills: 30th
So here’s a guy who’s offenses have never finished better than 20th and were in the bottom 4 four times out of five, yet he keeps getting hired by team after team. Why? He knows people and they like him. It couldn’t be more obvious whether you like it or not.