IMHO, Tyrese benefited greatly by getting traded to a team that gave him the keys to the car, that wouldn't have happened in Sacramento with Foxy around.
For Tyrese to have ascended like he has, no way that happens sharing the ball with Foxy. Tyrese would had been the SG in our system and that takes away his super power. Foxy on the other hand could have still gone on to become All-Star Fox (like he is now sharing the ball with Sabonis), because his super power is not predicated in controlling the ball all of the time.
Could they have made it work with Fox and Hali in the same back court? Possibly, if the Kings would have dumped Walton and got a real coach earlier.
But, can't cry over spilled milk, I think both Fox and Hali are on superstar trajectories, and that wouldn't have happened for Hali if he and Fox were still on the same team.