I reckon it's very debatable. You could say that for just about any other quality player in RM like Marcelo, Ramos, DiMaria in his prime, Benzema, etc.
That kind of reasoning is very tricky. Madrid might have had a player that didn't score as much but migt have scored in important games. Also possibly a more evenly distribution of goals across attacking players.
Madrid would have zero trophies in this era without Ronaldo. I don't think that's even debatable.
Mesut Özilis the first player to assist goals in 6 consecutivePremier Leaguegames.
Oh Yes Ozil is second in number of Assists , last 5 Years because of Ronaldo
Girouid TooYip, it is a huge reason he is.
Girouid Too