He is definitely not a legend for Juventus Turin. If that is called a legend, then what would he be for Real Madrid?
Ronaldo score hundreds of goal for Real Madrid and won 3 Champions League with Real. I am sure he deserves to be called as a legend in Real Madrid. Even you dislike him, you can not deny his contributions and achievement there.
Ronaldo is trying with everything he can to get back into the Champions League for the season. Also if he seeks to extend his trophy collection, Napoli would make a lot of sense. The question is whether Ronaldo really is the fit Napoli could even be looking for. They are playing a perfect season so far. Now if you get Ronaldo on board, it also means you get potential trouble on board. Or they decide to let him play anyway no matter what... But I don't like that concept. He won't come as a backup, meaning that Napoli must kick someone from their first eleven which so far functions perfectly fine.
Napoli is a risky choice for Ronaldo. They are playing well in both Champions League and Serie A but they don't have enough experience to win titles. What will happen if Ronaldo joins them, and shortly after that, Napoli will be beaten in 1/16 round? Ronaldo is not seeking to join a club like this if he can have better choices.
Likely Chelsea, according to rumor, are considering to sign with Ronaldo. It is the best choice for Ronaldo in this season but will he take it? If he joins Chelsea, he will have to play against Manchester United.