I also don't think Wrath was recognised by Gluttony, purely because as pointed out, Dante erased his mind and made him into a killing and eating machine. He went after Wrath probably because he was the first to move or because of the the aforementioned red stones. And even if he DID recognise Wrath, it wouldn't explain why he went after Wrath anyway. I don't recall Gluttony ever being told Wrath killed Lust, in fact after he did it, I don't remember it being brought up at all to anyone, so why would he go after Wrath for something he didn't know he did?
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