For sure we'll see Slade again, around Oliver's life, trying to ruin it, or who knows, maybe doing something different. And yeah, it was easy for Oliver to defeat him, but the same happened with RAG. I think that's just a problem of how the writers end a story. It's like they can't make Oliver defeat his enemies fighting for his life and making the biggest effort. They make a long development of his efforts during the season, but it doesn't mean that the last fight will be easy.
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