The difference is that now he plays more simply, relying on position and accuracy, while the young Ronaldo relies more on speed and skill. That is a good thing, because he can adapt to his abilities in old age, because there is no way he can rely on speed like when he was young.
I didn't even have that wild thought, Ronaldo will meet Xabi Alonso again but this time as coach and player. However, if that happens then that might be interesting too, but the problem is whether Xabi or Leverkusen want that, because they will now definitely focus more on young and mature players rather than players who will soon retire.
Yes, although the truth is I would like him to go there, because it would be great, many teams closed their doors on him when he left MU, but Xabi is opening a door for him, it would be great to see him and possibly win a UCL, as a farewell to his career and apart From seeing him play in the EURO and in the next World Cup, seeing him playing with his son in the Portugal national team, I think there would be a lot of macho tears out there lol (myself included) although I would say that it would be great if he also had to face a Messi with the Argentina that he is now, I think it would be the dream of all the fans of both players and a great way to say goodbye to football. As a player, because later I think they could consider CR7 as coach of Portugal.