The chance of Jaylen becoming Kawhi is about the same as Tatum becoming Durant, very low. The simple fact is its hard, and unlikely, that any given young player gets from where Jaylen is now to Kawhis level, because there are only 5 top 5 players in any given year and the amount of improvement you need to make every season to get to that level is high. I mean even Kawhi in like what his 9th season added a punch f passing too his game since last year.
That said I don't put any outcome past Jaylen, or Jayson for that matter. I'm just gonna enjoy the ride.