Kazuniya
read/watch dungeon meshi
Well. The Eternatus development from the new episode is setting up one of two things:Well, the 128 being Project Mew was debunked, but nothing about the villain arc.
I am on Copium
1) Leon will use it in the finals.
2) Someone will try to steal it again or use it or whatever.
But since Leon now has Eternatus under his command, I'm doubtful the second option will happen.
It is also possible it's not setting up anything, but if that's the case, I don't see why the writers would bother to write this segment. So I have to conclude that this is leading towards something.