I kinda took the original question over at Shapinglight's as a hypothetical - not so much DID Xander tell as would Xander have told had the opportunity arisen at the time. A lot of people seem to be saying that no, Xander would never have told under any circumstances 'cause he's just too noble and upstanding a guy. Which doesn't quite work for me in that timeframe - S6 was Xander at his most assholish.