yes, but there are only 18 head coaches. they are all former players. considering the majority of former players are anglo saxon, if you select a tiny amount of them, like 12, even randomly, chances are they will all be anglo saxon.
(5) Sanderson, Craig, Ayres, Blight, Shaw
(5) Lepptisch, Voss, Matthews, Northey, Walls
(5) Malthouse, Ratten, Pagan, Brittain, Parkin
(4) Buckley, Malthouse, Shaw, Matthews
(4) Thompson, Hird, Knights, Sheedy
(5) Lyon, Harvey, Connolly, Drum, Neesham
(3) Scott, Thompson, Ayres
(1) McKenna
(2) Cameron, Sheedy
(4) Clarkson, Schwab, Judge, Knights
(5) Roos, Neeld, Bailey, Daniher, Balme
(3) Scott, Laidley, Pagan
(4) Hinkley, Primus, Williams, Cahill
(6) Hardwick, Wallace, Frawley, Gieschen, Walls, Northey
(4) Longmire, Roos, Eade, Barrassi
(7) Richardson, Watters, Lyon, Thomas, Blight, Watson, Alves
(4) Simpson, Worsfold, Judge, Malthouse
(5) McCartney, Eade, Rohde, Wallace, Joyce
76 senior coaching appointments in 20 years.
1 (Barrassi) non Anglo Saxon. Meaning 98.6% of coaching appointments in 20 years have been Anglo Saxons.
I don't think at any point during that time that Anglo Saxons accounted for 98.6% of playing lists.