You really can’t expect Vinicius to lead the team this season. He’s not ready yet and he lacks consistency, and with aging Benzema and forgotten Bale they lack a star man upfront.
Kante would be a great addition to any team, but I’m not sure if he’s the difference between a successful and unsuccessful Real Madrid.
I don't think that Hazard is going to be the difference between a successful and unsuccessful Real Madrid either. I think that their central midfield is and was a far bigger issue than upgrading Vinicius. I also don't expect him to lead the team, I would expect them to play as a team and veterans like Bale, Benzema and Kroos to lead in the attacking zones.