I understand Tatum has been good this year within the role he's been asked to play, I understand he he is young and I certainly think he has a high upside, but we just don't know. Even as good as Tatum is for him to be a top five NBA player and MVP candidate he will have to improve immensley ina areas like off the dribble shoting, man to an defense, ball handling and passing. Thats not an ammount of improvemnt you just can just assume from anybody. The odds are simply aginst Tatum ever becoming as good as Leonard. Players stagnate in their devlopemnt all the time. Look at Smart, who has improved somewhat but is still largely the same player he was. Or Aaron Gordon who has made strides since his rookie seaosn but still isnt as all star. Or Wiggins who has gotten worse. Tatum reaching a super star level cannot be the assumption. And as much as I like Brown, and I'm one of his bigger supporters, the same is true of him. I hope they both get there, but its far from certain and the smart bet would be they end up soemthing less than MVP level.
That said, I still might not trade Tatum for Leonard for the reasons like more has to go out with him to make salaries work, Leonard has one year left on his deal and his injury situation is very scary to me. Or maybe its better just to hope Davis becomes available next off season. And Tatum/Brown's potential does count for something. Just dont think its a smart idea to dismiss the trade out of hand because Tatum is gonna be as good as Leonard, cuz he very well might not.