i am having problem with nagato edo tensei no matter where you put him it takes edges for him to use his mystry , in some cases it took him 2/3 rounds even then he didnt shoot his mystry .
Might be lag so try auto and see if nagato can fire it off normally because I highly doubt this would only effect you, but most nagato are working fine from what I see.
After a few tests with Nagato, I can assure you he works fine. If you are able to provide a video or gif of your issue, that would be greatly appreciated.
Video with just Nagato and Main character vs Kakashi clone Would be nice for this. Set to auto battle. Auto battle should trigger any available mystery skills BEFORE they use standard attacks. Nagato not being prompt mystery means that he will wait until it's his turn to use his standard attack BEFORE using his mystery IF it has already been activated. IF he uses standard...then mystery is used....All ninjas will attack...then all ninjas will attack the 2nd turn UNTIL it's his turn to use his standard...then he'll use mystery and THEN use standard.
Kind of annoying, but we can better see it if posted as a video/gif.