They have done it before, is why I thought it. They just write characters off that aren't popular. I didn't like him though, I suspect they did their research and found out that he wasn't popular. So either get rid of him or kill him off, but he doesn't fit Dexter's code for kills.
I really don't like Quinn either. is it me or does he look like a heroin addict?
I knew he didn't fit the code, which is why I thought we were going to find out he was up to something that would make him fit. They gave every indication of that last year.
Quinn is another one that I don't understand the writing. And you're right... he has lost way too much weight.