It's odd that you "randomly" picked 2011, but as I'm sure you know there's been a shift toward offensive HC's in the last decade - especially when you consider the proportion who, as of today, would have their teams in the playoffs (bold) or in the hunt (*):Slow day at work, but in 2011 (chosen at random), here is my count of offense vs defensive head coaches (Playoffs in bold):
OFF (13): BUF (Gailey), CLE (Shurmur), TEN (Munchak), IND (Caldwell), SDC (Turner), OAK (Hue Jackson), HOU (Kubiak), NYG (Coughlin), GB (McCarthy), PHI (Reid), DAL (Garrett), NO (Payton), SF (Jim Harbaugh), ARI (Whis)
DEF (14): NE (Belicheck), NYJ (Rex Ryan), PIT (Tomlin), CIN (Marvin Lewis), JAX (Jack Del Rio/Mel Tucker), DEN (Fox), DET (Schwartz), CHI (Lovie Smith), MIN (Leslie Frazier), ATL (Mike Smith), CAR (Rivera), TB (Morris), SEA (Carrol), STL (Spagnuolo)
It's complicated (3): MIA (Sparano-OFF, Bowles (DEF), BAL (John Harbaugh-ST), KC (Haley-OFF/Crennel-DEF)
OFF (17; 10 would be in playoffs if they started today with 2 in the hunt):
ATL Smith (OC TEN) *
CAR Reich (OC PHI)
CIN Taylor (QBC LAR)
CLE Stefanski (OC MIN)
DAL McCarthy (OC SF)
DEN Payton (OC NYG)
GB LaFleur (OC TEN)
IND Steichen (OC PHI)
JAC Pederson (OC KC)
KC Reid (QBC GB)
LAR McVay (OC WAS)
LV McDaniels (OC NE) [Pierce LBC LV]
MIA McDaniel (OC SF)
MIN O'Connell (OC LAR) *
NYG Daboll (OC BUF)
PHI Siriani (OC IND)
SF Shanahan (OC ATL)
DEF (13; 2 would be in playoffs if they started today with 4 in the hunt):
ARI Gannon (DC PHI)
BUF McDermott (DC CAR)
CHI Eberfluss (DC IND)
HOU Ryans (DC SF) *
LAC Staley (DC LAR) / Smith (OLBC LAC)
NE Belichick (DC NYJ)
NO Allen (DC NO) *
NYJ Saleh (DC SF)
PIT Tomlin (DC MIN) *
SEA Carroll (DC SF) *
TB Bowles (DC TB)
TEN Vrabel (DC HOU)
WAS Rivera (DC SD)
It's Complicated (2; both would be in playoffs if they started today):
BAL Harbaugh (ST PHI)
DET Campbell (TEC NO) [OC=Ben Johnson, DC=Aaron Glenn]
So to @RON_IN_OC's point in the post to which you were replying, there are "going to be fewer defensive HC's, overall", and based on this year, the proportion of offensive HC's who make the playoffs is MUCH higher (10-12 / 17) than for defensive HC's (2-6 of 13).
EDIT: Going back to 2022, the numbers support @RON_IN_OC's point even a bit more, with a 3:2 ratio of offensive to defensive HC's, 1/2 of the offensive HC's making the playoffs, and 1/3 of the defensive HC's.
OFF (18; 9 in playoffs):
ARI Kingsbury (OC TAMU / Houston)
ATL Smith (OC TEN)
CAR Rhule (OLC NYG / OC Temple)
CIN Taylor (QBC LAR)
CLE Stefanski (OC MIN)
DAL McCarthy (OC SF)
DEN Hackett (OC GB)
GB LaFleur (OC TEN)
IND Reich (OC PHI)
JAC Pederson (OC KC)
KC Reid (QBC GB)
LAR McVay (OC WAS)
LV McDaniels (OC NE)
MIA McDaniel (OC SF)
MIN O'Connell (OC LAR)
NYG Daboll (OC BUF)
PHI Siriani (OC IND)
SF Shanahan (OC ATL)
DEF (12; 4 in the playoffs):
BUF McDermott (DC CAR)
CHI Eberfluss (DC IND)
HOU Smith (DC STL)
LAC Staley (DC LAR)
NE Belichick (DC NYJ)
NO Allen (DC NO)
NYJ Saleh (DC SF)
PIT Tomlin (DC MIN)
SEA Carroll (DC SF)
TB Bowles (DC TB)
TEN Vrabel (DC HOU)
WAS Rivera (DC SD)
It's Complicated (2; 1 in the playoffs):
BAL Harbaugh (ST PHI)
DET Campbell (TEC NO) [OC=Ben Johnson, DC=Aaron Glenn]
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