Remember this when you say a released champ is OP
Riot is fundamentally a business, which means they want to make money.
While customer satisfaction is a priority, we can safely assume that making money is priority #1.
Money is more likely to be made when people are buying champs, and people buy champs that are: A. New B. Powerful C. Fun
Ekko is all of those, which means that people will buy him, making Riot money in the end.
Is he OP? Hell yeah. Why? Because it gets Riot money.
Will he get nerfed? 99.9999999999% sure of it. ...And I say this because almost every champ Riot releases initially is OP. I mean, VERY OP. Take Azir for example -- when he was released, he was incredibly OP, but no one knew how to play him. Once people started figuring out how powerful he was, he got nerfed. Ekko is the exact same thing, but with a smaller learning curve. I think it's quite reasonable to expect an upcoming Ekko nerf within 5 patches or so.
Just my thoughts.
was super overpowered.
is OP as shit right now? Because of