after spending some time in the stacks
There’s no reason to believe dragons don’t feed on magic when they’re awake so they’re all still feeding on the magic of the world. Mordy being awake hasn’t changed that.
If we assume Zhaitans magic spread out evenly through the world then Mordy wouldn’t get more of it than the others so their relative power would remain unchanged.
When one dies it’s power doesn’t automatically go to the others, it’s just one less dragon feeding so Zhaitan’s death doesn’t make the others more powerful than they were before.
Scarlet did us no favors waking Mordy and just added a new player to the game for us to worry about.