I haven't read the book so I don't have an opinion on it, and I do like Cho as a character, but goddamn every picture of him as Hulk makes him look douchey.
I "love" how the article specifically asks to discuss the potential in-universe reasons and not the Fox situation speculation, and everyone in the comments are like "lawl movie rights" anyway.
Does it have to just be in the show or the entire series. In the show: Splinter, because he's totally badass and Hoon Lee gives the best performance in the show. In the whole franchise: probably Shadow Jones or Leatherhead.
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