Fine, Shaper versus, Drakons. There is no human/servile rebellion. It is now a battle between who will be THE power on the continent. Lets compare.
Drakons are haughty to everyone and everything, especially the new drakons. There are some exceptions, mostly the older drakons though. Shapers can be modest or haughty. Almost all believe they are above outsiders and be expected to be treated differently, most do not act haughty, more of I have power and we both know it.
Shapers have tried to eliminate all intelligent life to protect themselves and innocents from rebellion like the current one. Drakons are intelligent life and once claimed the right to live, but now it seems more like they want a kingdom of their own. Notice how they treat others (humans, serviles, drayks) in drakon dominant habitations. The drakons would most likely act similarly to shapers if they became the dominant power; they woulddestroy things that threaten their power i.g. intelligent beings.
Shapers have kept close tabs on shaping so that the power does not fall into the hands of maniacs like Monarch, or others who would seek power. This prevents the creation of intelligent life that could threaten shapers and innocents, and also disasters like monarch or a less refined Purity Agent. Drakons are for the ability to shape being more widely available (for now) which means a MUCH higher chance of disasters occurring. Human greed is often underestimated with disasterous consequences. And what about if the drakons came into power? They would need to apply limits on who could have shaping unless they wanted to deal with disasters and civilians rebelling against them.