Dragon’s motivations make no fucking sense.
“Hey I’ve been enslaved and forced to fight against my will in a weakened state, I’ll probably die and if not I get to keep being a slave. Oh I’m free now? LET’S KEEP WORKING WITH THE SLAVER’S SIDE!”
I could see him being fine with the rider prince given he freed him and was in the dark but why the fuck would he keep helping that side of the war?