I agree, lets keep collecting data. From my two teams the data for this season is below, in the format: Name, original quality, % increase with head coach
GK D.Morse 68.00% 31.30%
ST S.O'Callaghan 61.60% 32.50%
AMC D.Lynch 60.30% 32.70%
AMC C.Ormonde 59.70% 36.10%
DR R.Owusu-Ansah 59.20% 36.20%
ST J.Murphy 58.20% 36.40%
ML J.Linney 57.40% 36.80%
ST S.Cadogan 55.00% 37.40%
From these I will be focussing on Ormonde and Owusu-Ansah as they seem to gain more % than they should do.