So after considering these number there are 23 CAS boys in Australian Schools Champs with each school having the respective numbers:
Knox: 7 (Tom Gratwick, W.Kablau, D.Breden, E.Grobler, S.Rechner, O.Cheal, O.Evans)
Waverly: 6 (A.Rice, M.Amatosero, M.D’agostino, R.Volkman, L.Milford, W.Fagan)
Barker: 4 (A.Brown, J.Cameron, L.Vass, D.Wilson)
Cranbrook: 4 (T.Smith, H.Hayman, P.Tagg, A.O'Reilly)
Trinity: 1 (S.Vuki)
Aloys: 1 (S.Spalding)
Also need to consider that Pollard isn't counted in this and any others like him that are taking different pathways.