There's a difference between being inspired by something, and just repackaging it with a slightly different name and characters.
Just look at the Watchers of Ulduar, and the associated characters. Thorim? Loken? Hodir? Mimiron? Hell, with Tyr and Sif they didn't even bother to even slightly change their names! The whole Thorim/Loken storyline is just a complete copy from Norse mythology, as are all the Watchers essentially.
So no, that's not borrowing "snippets" - that's just plain copying.