Dont be stupid, do you know how old ronaldo is right now? by the time kane get to the age where he is much better and much deadlier striker then probably ronaldo will already retire. Playing with better player is actually a gift which means that you need to work your ass twice harder to make sure you get into the startng eleven
I don't understand people like you who think that Ronaldo is the best. From my point of view, many players are better than Ronaldo and if Kane works hard, he can quickly become better than Ronaldo.
Both him and ronaldo is very different. Not every player could be the next ronaldo or messi so dont even bother to hope for such absurd thing. Kane will always remain kane no matter which club he moves into however there is a high chance that real madrid will sign him and he will play alongside ronaldo soon