I very much doubt they're true. The big star of Sarri's Napoli wasn't Mertens, it was Insigne and even more so with Chelsea, it wasn't Morata/Giroud/Higuain, it was Hazard. Seems only natural to me that Ronaldo assumes the big creative responsibility and leaves the 9/false9 business to Dybala, Kean, Icardi, Higuain or whatever