Kuros are born from Darkness, they are darkness embodied in a dragon species. Because of this, at least in Skylanders lore, when others are consumed by darkness or have dark forms, they mimic traditional Kurosian colors (the iconic black and silver) or they gain black markings (like Kaos and Wolfgang). Spyro’s dark form would appear Kurosian like, but it wouldn’t actually turn him into a Kuros. In WL canon, Spyro is corrupted by Darkness when he attempts to follow Feuriah and Kaos into the Veil. He’s able to slip in for a moment, but pulled out by Blackout and Knightmare before Breith is even aware he’s there (or, just watched curiously).
At first he can’t master it at all, but with the help of his friends and Eon he learns to control it. Eventually learning to switch it on and off. That’s pretty much what I had canon for WL (he’ll sometimes switch to piss Feuriah off into an uncontrollable rage, a surefire way to be a distraction), and I feel like that might be what the show will do. Not certain, just a guess!
~Weird Hyenas
Weirdlanders 