Satoshi doesn't strike me as the type of person who'd brag about that. I don't think Shirona would be surprised anyway considering that she always seemed to think highly of Satoshi as a trainer, so she probably expected great things from him especially after she witnessed his Shinou League battles.Here's something that just hit me I'd like to see...
Ash: Hey Cynthia, guess what? I'm a Champion now too!
I want to see Gen again as well. Not that he was my favorite Shinou character per se, but he seemed popular enough to warrant a comeback especially now that Satoshi has his own Lucario.