Or, you know, it's just sheer exhaustion.In chronological order, the post credits scene was just after the battle, so with the exception of Black Widow, Hawkeye and Stark, the rest are strangers. Its only in the "separation" scene (Thor taking Loki & the Tesseract away) that there's any sort of budding, sort of friendly acknowledgement between the members (punctuated by Steve shaking hands with Stark).
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