Some interesting stats of players keeping vs non-keeping:
Sangakkara: 81.31 vs 41.24 as keeper
Walcott: 64.67 vs 40.36 as keeper
Stewart: 46.70 vs 34.92 as keeper
Phillips: 40.31 vs 29.12 as keeper
So this definitely implies that keeping takes a bit away from the batting and therefore maybe Gilchrist would be averaging 60 if he was just playing as a batsman
Seems like a sound argument until Flower goes and messes it up by actually averaging more as a WK then as a batsman (35.45 vs 53.71 as keeper)