Not a bad theory, but if Axe was the spy, wouldn't Gideon already know about the two groups uniting anyway? This is this guy's main reasoning for why the Armorer isn't the spy (with which I agree), but then it seems also to cancel out Axe as well, because why wouldn't Gideon have gotten that same information from him? That he wouldn't have told Gideon all this but then tells him all that after Gideon spoke to Elia Kane is convenient timing for this theory, but makes no logical sense. If he hates Bo Katan so much, why wouldn't he have contacted Gideon immediately after losing control of his Mandalorian mercenary sect? It's not a bad theory, but it's got that rather big hole in the middle of it.