Pushing it.
I don't know where you got that info from about Muntari being the midfielder with the highest tackle/minute ratio. I really can't be arsed to track how many minutes Muntari/Nigel/Monto have played but when it comes to tackle/game ratio:
Muntari: 35 in 26 games: 1.20 pg
Monto: 54 in 29 games: 1.86 pg
Nigel: 56 in 33 games:1.70 pg
Avg duels won:
Muntari: 37%
Monto: 48%
Nigel: 48%
Avg defensive actions per game (blocks, interceptions and clearances):
Muntari: 1 pg
Monto: 3 pg
Nigel: 5 pg
Chances created (assists + keypasses):
Muntari: 29 in 26 games: 1.1 pg
Monto: 44 in 29 games: 1.5 pg
Nigel: 20 in 33 games: 0.6 pg
Avg pass accuraccy:
Muntari: 79%
Monto: 85%
Nigel: 91%
Goals scored:
Muntari: 5
Monto: 3
Nigel: 2
2013/2014 season stats
Source:
Squawka
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This is coming from someone who actually likes and rates Muntari aswell. But 'best midfielder' is based on nothing. He's clearly going to be competing with Bonaventura for the lcm spot, and my gut tells me the substantial investment has some kind of advantage over Muntari.