My thought on how Spirit SHOULD have ended...him coming home to find his herd had been taken over by Rokslyde, the rival stallion (because there is no WAY Spirit could have been gone that long and NOT have his herd taken over by another stallion). Yeah, I think the old buckskin needed one last fight to get his family back. Here, we have Rokslyde charging at Spirit and ready to duke it out for the rights of the Cimarron Valley and the herd.
Blank render generously provided by Bluehawk's_ghost.
Colored by me, Rokslyde is (C) MW Roach