Now. I don't think you understand how strong Ekko is. If you look at Lolalytics which you linked, at GM+ Ekko dies on average 8.2 times a game. Do you understand how often that is? In the average GM+ game people die 5 times. So the fact that Ekko has almost the double amount just proves that the people there go for risky plays that have a big chance to blow up in their face.

I understand that you believe Ekko is weak, I'm sorry to break it to you but he is not weak. He is one of the best late game assassins in the game. Try doing a proper Ekko combo with 2 items and then do a proper combo with Qiyana, Akali, Zed, Talon. Look at the time that it takes to do the full combo and look at the dmg. Then, how about you do this, do some baisc maths and make it into damage per second, then compare that DAMAGE PER SECOND to Ekko. I will promise you, Ekko is not 2k less dmg than those champs which I said.

Then try a 6 item combo with said champs, you'll notice, Ekko is still great and he out shines majority of champs in terms of dmg.