A theory of what was it that killed Yasuo's elder

Ok, so this is just me grapsing at straws, so let me leave that clear. Anywho, as we all know , in Yasuo's lore, there is a elder that has suppost to defend and he didn't and the elder was killed and Yasuo was blamed. But I do not think that Yasuo was the killer, after all he was off in the boonies fighting. Then there is Riven, who could be the killer, but I do not think that it was her. She was fighting out in the open, as Riven and her command did not like invading towns and killing people that are not soldiers. "Handling civilians was a chore that had wearied the men over the past several weeks". They’d been trained to kill soldiers in battle, not to dispatch helpless bystanders. Ionia didn’t even have a standing military." That was in Riven's Judgment So if it was not Riven nor Yasuo ( I think that Janna is kind out of the question, but who knows, may during her menstrual cycle she goes around killing elders) who was it. Well if you read Yasuo's lore you know that 1.The Elder was killed by a wind technique and 2.Yasuo was the only student in a generation to master the legendary wind technique. So what the acutual fuck right ? Anywho I think that killer is a unreleased champ, and b4 you go saying "Ohhhh really" I think I also know what is the Race of the Champ. I think that the champ will be a Darkin, for a couple of reasons. As it is written in Aatrox's lore, he is ancient, meaning that Darkins must have some form of immortality, at least age does not seem to kill him. It is also written that only 5 Darkins remain, and only 3 are known to history in any way. What if one of those 3 is a Darken that, much like aatrox is over a generation old, is also old and knows the wind technique ? Since there have been other sudents of the wind technique, but from over a generation ago, so the dude is old and most possibly imortal, at least age wise. The reasons why a Darkin would go after a elder, only Riot could tell, but again this is just me and what I think could be a champ waiting to be released, remiding you that Riot has already announced that they have 6 champs in development and I think that one is the Darkin that killed the elder. Pls tell me what you think and if you have a opinion pls share it, thanks