1 - I don't believe Kane will leave Spurs for an english club
2 - Is this life only about medals? Let's say Kane will leave Spurs. He will play for another club for 4 years, taking one championship and 2 cups. Fine. And then? He will finish playing for top level, will play again for a medium club and that's it. He will not be a true legend anywhere! After he leaves, nobody at Spurs will have him in the middle of the heart, he is gone and fuck him. What if he stays? He will not win medals but he will be a true legend for this club, playing as a kid until retirement, he could also be part of club future organization (coach, manager, who knows?). Look at ledley! There is life after being a player. Players like Ledley are legends not only for Spurs, but they even get respect from everybody for such a commitment for one single club.