This is a really disingenuous statistic, to the point where anyone seriously suggesting that playing Gundogan we're more likely to lose has to be considered an idiot.
He's started 24 games and lost 6.
Those 6 are Liverpool at Anfield x2, Manchester United, Wigan, and 2 games Pep pretty much threw against Shakhtar and Basel.
So rule out the 2 games Pep made 10 changes for and didn't take seriously, and you've got 3 losses in 21 starts.
Those 21 starts include an incredible performance vs. Napoli away from home, probably MOTM against Spurs, and a very good game with 2 goals which sealed the Basel game and let us rest 90% of the team for the cup final, which he also played in.
He was also a very good Fernandinho replacement when we beat Chelsea and Arsenal back to back without conceding a goal.
Fact is, Pep brings him in for big games, and surprise surprise, we've lost a couple.