Well, Hughie's fate could go any way. For me the obvious route is for him to be the one to finally stop Butcher, but with Ennis at the wheel anything could happen.
But I think the situation with Hughie and Butcher is more complex than you suggest. Butcher went out of his way to recruit Hughie because he wanted someone who had felt the cold disdain of the Supes, and someone who had felt the same loss of a loved one. We know that Butcher generally only makes a disclosure when it's in his interests, but the 'little brother' aside was hardly a deal-maker for Hughie. It was the last vestige of Butcher's sentimentality showing through, and also an unspoken indication of the role Butcher wants Hughie to embrace.
Look at what Ennis has explicity shown us. Yes, he said he wanted a little brother, but he obviously didn't want to have to explain to Hughie that he once had a brother who was killed in a meaningless accident. So you just get this seemingly throwaway line early in the book, that he always wanted a younger brother. What he wanted to say, but couldn't, was that he wanted someone to inhabit the little brother role. That's why Hughie's on the team. If Butcher had just wanted to make up numbers, he could have recruited another soldier, psycho or strategist. When Monkey asks why Butcher needs a fifth member, he is just told to shut up, because Butcher cannot justify it to himself, let alone Monkey.
Then later, in a key section of the Butcher mini, we hear Butcher say, in a way he barely understands himself, that once his brother was gone, there was no-one to stop him. And that's all you need to know about the little bro's character right there. He could stop Butcher. We've had a glimpse of Butcher's self loathing, and deep down I think he wants someone with the moral strength to stand up to him. And he's torn between corrupting Hughie and having him there as some missing aspect of his life, his conscience. Well maybe I've gone a bit too far here, but you get the idea. To put is more concisely, I think Hughie was hired because deep down, Butcher wants to be stopped... not by his adversaries, but by someone he likes.



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