I think his contrasting form for club and country are a result of a number of factors, but I don't think the captaincy is one of them; after all, he was the leading scorer in this calendar year and captained Spurs for the majority of those games.
His lack of goalscoring comes down to two key genuine factors (not the presence of an armband):
-the absence of a target man to play with (his most recent successes were alongside Berbatov, and before that, Mido).
-the lack of a creative and dominant midfield to get the ball to him. He has to drop deep with Ireland because he never gets the ball.
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