It's okay for rebuilding teams to have good players on their rosters. This is a belief I have held for many years; not every player can be a cornerstone, and solid starters aren't going to corrupt a rebuild.
That may be the stance the Chicago Bulls need to take on Coby White moving forward: is he a building block? Maybe not. Is he a good, productive scoring guard who can help out a contending team? Certainly! Those players are also valuable, especially if they've steadily improved in their tenure with said team like White has.
I said earlier in the season that White's impending free agency has no easy answer.