I never really wanted Kaos to apppear until the very end (because I didn't want to make it a boring generic Skylanders story) but I'll see what I can do. This was actually my idea for the next one.
While digging through an old chest, Spyro discovers a book about another purple dragon who was born the same year as him. Spyro finds this impossible seeing as only one purple dragon is born every ten generations.
Spyro discovers that this dragon's name is Paris and was thrown into the Galactic Generator by the Mecha-Drago, causing her entire essance to be destroyed, and the purple dragon prophecy was reset, causing Spyro's birth.