That's basically what ive been saying. But no-one scrutinises it because his team his winning. You can still be a good captain and lose. It's whether you have the players who can do what you ask.
I've captained teams myself. The first had the players and I had a lot of success. We actually won the premiership that year :-P The second were hopeless, and it was really hard.
Flem cannot captain the way he would like because he doens't have the players.

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Flem as a bowler or McGrath as a batsman. Who is worse? Hmmm....