Comparing Magnus to Kasparov is kind of like comparing Steph Curry to MJ. Could it happen? Yes. But Magnus has to go out and do it. I think if he can beat Firouzja he makes a better case but tying Caruana and Karjack at classical wasn't all that impressive. Beating the great Anand was.
(Actually, MJ is probably a bridge too far for even Curry. Maybe LeBron is a better comparison.)