Refuse to believe Dark Spyro is like gone. There was an explosion of light and energy that's not proof enough for me. I didn't see him like dissolve or disappear. I don't believe Spyro would have survived and his copy wouldn't have,, I think he's in hiding [though probably still very injured]
And I think if season 4 happened there would be an episode where someone stumbles across Dark Spyro and misses Spyro so much since he's off doing family stuff and DIDN'T even say goodbye or tell anyone,, So they try to befriend and hang out with Dark Spyro and Dark Spyro uses it to his advantage [particularly to get medical supplies and healing potions so he can heal from the fight].. also the someone is Eruptor it's 100% Eruptor
If I ever get around to writing a Season 4 / my rewrite this episode will be included.. I think it'd be relatively early in the season.. maybe a few episodes off from mid season 🤔