Personally I'd always separate when composers are somehow involved in an album or it directly represents a product, and when their music is just reused/arranged/featured for other purposes (doujin or official). In the Smash Bros example now it may seem like all the composers worked on the albums, or that their compositions are meant for the game, that's a bit disinformative.
Then just separate the discographies in several lists, like "featured on - reused music" and "featured on - doujins" (since there are so many of them they deserve their own list) or such.
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