Idea for a sequel that would be different than the enquired Disney one

You answered my questions about sequels, but I just wanted to see what you thought of my idea for a sequel. What if they made a sequel that concentrated on Creeper. I hate to admit, he was much more interesting than and not as bland as Disney's version of Taran, who Creeper called "Pig Boy." Creeper tried to be evil and ruthless, but ended up being stupid and worthless, and endearingly so. For example, he wanted Henwen dead when the Horned King needed her alive, meaning he overdid it, Creeper. Then, he encouraged Taran, Eilonwy, and Fflewdurr to jump into the cauldron, ignoring the fact that they were chained to the wall! Taran should have made that point to him, and he should have stood up to Creeper, who despite his attempts to be evil, was harmless. That's why Taran just let Creeper grab his leg after he helped Henwen escape. Taran could have broken free, that's why I don't like his character, besides his whiteness (banality).
Anyway, this sequel would have showed how Creeper wanted power in Prydain and to be revered so he goes on a quest to stop a new threat unaware of his powerlessness. Maybe someone other than Taran can help him reluctantly and even lead the egotistical Creeper to gain a heart and learn more about lusting for power.
Now I know this goes against the whole "Chronicles of Prydain" series than the Disney Black Cauldron did, but I thought this would have been a good experiment as long as it had good writing which all the Disney sequels didn't. It's meant to have fun, and teach lessons to not only Creeper, but everybody. And I'm aware that Creeper was the only character in the movie who was not in the books. And I was suggesting they should have continued his story because when we left him, the Horned King was killed, and he was free and rode that dragon thing to freedom.