Oh, hey, as I said in the other thread, I've read a ton of Terry Brooks. His Magic Kingdom for Sale serious was a blast. Fantastic stuff.
One thing that came up in the previous discussion is why we throw shade at Terry Brooks for ahem drawing from Tolkien but we don't throw shade at Tolkien for his sources. There is a major difference between the two.
Tolkien would have been the first in line to point to his sources. If you walked up to Tolkien and told him that he was copying stuff, he'd be the first to agree with you. It was never a secret or even hidden that he was drawing inspiration from other sources. That was largely the point of the stories - that the Lord of the Rings was a retelling of an other story. Sword of Shanara, OTOH, wasn't supposed to be a retelling of Lord of the Rings. It was supposed to be an original story and was marketed as such.
That, to me, is the primary difference.