To get back to seriousness. I do think Butler can be a superstar. I don't think he is Lebron or Durant or Curry who probably get you get a top 5 seed each year if healthy with very little else on the roster. However, I do think if you magically added him to our roster without taking anything away we would challenge to win the East. With a few other additions (more shooting and a little better interior defender) I think we could be right where we need to be. He definitely is a good defender, however, the biggest difference for our team with him is that he can really create his own shot and draw contact. His presence would really open things up Bradley, Crowder and Thomas to get better looks on the offensive end, and more opportunity for Thomas to drive.
I think he is the ultimate buy-low candidate right now. The bulls, partly through bad injury luck, have really screwed up their team. Injuries turned Noah from an above averaging starting center to a below average bench player before ultimately sending to the IR. Rose's injuries really sapped him of the super elite athleticism that made him so good and he hasn't made adjustments to his game that he needs to be a more well rounded less athletic player (no improvement in shooting, no improvement in being a distributer off drives). Gibson is an average big man that was in and out of the lineup all year. Portis is a nice prospect, but was not ready to be a rotation player on a playoff team and Mirotic seemed to not get any better between last year and this year and has a real propensity to jack up deep 3's. Gasol seems like he is completely empty stats at this point. He grabs an amazing amount of rebounds and can certainly still score, but seemed to really struggle on defense. You look at that roster, and watch them play (which I actually did a decent amount this year) and it is really not on Butler that they did not make the playoffs. I think he will definitely continue to grow and develop as a star on whatever team he joins.
So to answer the question of why the Bulls would trade such a star? Well what we can hope is that their front office is as dysfunctional as it has appeared the last few years. Forcing Thibs out, hiring Hoiberg, seemingly holding on to a core group that has continued to erode for the last 4 years to watch Noah and Rose become complete non-assets. Maybe they really do pick Hoiberg over Butler...