As a Chicagoan, I thank you for not saying “Willis” tower.
As for the concept, it’s great. I like the alternate logo, but I can agree that the primary logo is a bit similar to the Fire’s logo. Love the striping on the pants too.
I also found this video...
https://m.youtube.com/watch?v=YSLTabMSYUg
Steals @R3Gs jazz logo http://boards.sportslogos.net/topic/107832-utah-jazz-logo/?do=findComment&comment=2600157