Each strike boss now has unique legendary items they can drop. So Valus Ta'aurc, the Cabal commander known for his multishot tracking rockets and accurate heavy machine gun, drops a unique scout rifle. Where is the logic in that? Who thinks of him and then says he's a scout rifle guy?
I do like the idea of the unique drops and some are fairly cool, like the Titan mark from Undying Mind (see my Titan), others just make no sense. Bungie, please put more thought in relating the unique drops more to the bosses, and give the weapons as much visual care as the armor.
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The scout isn't specifically for valus, it's for all cabal strikes