GGWP found this Ekko penta video

Abortions of Riot.

so he 1hits a almost full hp jinx + yasuo and a low hp hecarim with his ult... he really 1shots them. you know any other champs that can 1shot? veigar? yea right lol.

Well, he was about 3 levels higher than everyone else in the game, so we can assume he's super fed already. Besides that, the video doesn't show any items so we can't really say for sure. But I'd say that most champions being super fed could do the same thing. If it was a fed for example, and the whole enemy team got hit by every one of his spells then yeah he'd get a penta too.

Not to mention only Hecarim and Morgana even tried to attack him.