I don't go in for any of the MOTUC bios (I much prefer seeing the figures for what they are) but if I was to ever have a personal canon, Horde Prime would be the nemesis of Light Hope. He would eventually slay Light Hope in a powerful battle. Light Hope's body is subsequently buried in a tomb deep in the Crystal Castle, and being the living embodiment of all that is good, he becomes the Filmation version of Light Hope and is instrumental in providing guidance and rule over the Great Rebellion.. or something like that. I basically see Horde Prime and Light Hope as being near equals who fight this huge final battle.
I also like that Light Hope could be some sort of living embodiment of the Crystal Castle, much like Castle Grayskullman. But prefer the former school of thought. I'd say if the bio reflected this then I'd be pretty happy they were providing good justification of the character, but as previously stated, i don't really go along with the MOTUC canon.