I agree with NO. Koakis are like Fur Hires in June 2018, they swarm, destroy and negate in 2-3 moves at maximum, what is more overpowered than that. Hey Trunade made them so explosive. All because of Diamond Core and its protection. I can say that meta was balanced in November and December 2018, but now it is ruined.
I don't know what was in konami's dumb head releasing diamond core without any kind of counter to it
In legend 7 out of 10 games are koaki
they nuke the field with trunade reckoned power and maximus in the 2nd turn and game over
even 3 sphere kuribos are useless against them because kuriboh only affects 1 monster and they have 3 2000/3000 atk beaters in the same turn