If he makes all-NBA, which he very well might, the odds of Jaylen turning down all that money are very, very slim.
Even if he doesn’t get all-NBA I am not convinced Jaylen leaves, and if he wants to stay I would max him and keep him.
If he does leave, though, it might be because Tatum gets featured more than he should. How many games have we seen where Jaylen was scoring easily, Tatum was cold, and Tatum still got the last few shots? Too many.
My biggest hope is the team sticks with what they have been doing recently, and let smart or white bring up the ball. They also need to mix up their end of the game sets. The best outcome of all, bar, none, is Jalen stays.