Usually, when on org decides to pick up a 17yo from a T2/3 domain, they should intend to develop him to be a star player. But that was not what TSM intended for bang, they brought him in expecting a star player effect. Surprise surprise, it didn't pan out. So what is the conclusion here? TSM sucks.
Although I wouldnt say they screw with his career. Now that Bang had some T1 exp, orgs will look at him. He also shows up in his duelist role as well as Sage. I can see saner orgs picking him up to develop him to be a tier 1 player.