For me it is Alexis.

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Joined at his peak dominated while carrying the team for long periods of time who could do it all. when he left he really didn’t play well so losing him wasn’t too bad barring how the exit happened.

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2nd is Ozil.

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Could turn a game in a split second, many individual highlights but the difference between his best and his worst were too far.

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I’d love to say Fabregas/RVP next but losing then when we needed them most hurt

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I’m sure a few from the current team will be up there in the near future