>https://m.youtube.com/watch?v=IK8QBXIGmIg&pp=ygURSGliaWtpIGFuZCBrb3RvbmU%3DCan Timeskip between JN and HZ serve as a good excuse for Ash and Serena's chemistry to change to something more like Hibiki and Kotone. If Tomioka wasn't forced by executives to copy Naruhina than Ash and Serena's chemistry most likely would have been like Hibiki and Kotone considering Tomioka was a head writer of Brave Beats and also wrote Ash and Dawn's chemistry on DP series. I think that executive name was Shūkichi Kanda. Who the heck use plot points for romance and female characters from freaking Naruto of all things.
FYI : This is not off topic because I'm talking about Serena, her chemistry with Ash and Tomioka's writing skill.