You are entitled to your own opinions, but not your own facts. Stop making up stuff.
The lowest # of tackles per game Gana has ever had was 3.5 and he's been over 4 every other PL season. McCarthy's highest ever in the PL was 2.7.
In terms of interceptions per game, the lowest Gana ever had in the PL was 1.9 and he's had much higher than that with us and with Villa (where he had an insanely high number). McCarthy has never been higher than 1.8, which wouldn't have beaten Gana's worst season.
He has NEVER been anywhere near the player Gana is and was. It's not even close, not statistically, not in reality.
I'd probably still take him over Schneiderlin, but neither are particularly good, especially not anymore.