surely this is something someone with unlimited power could do
That is a pretty STUPID way to think.
Would a DOG of unlimited power and intelligence have to violate his own laws of physics because he has to raise for the dead so many people because his plan was so bad in the first place.
1. Like as- when he is making the planet bigger - where do the people go till its done?
2. Will humans have and every other living thing have to evolve to handle the HIGHER gravity on our now bigger world?
3. Will the O2 we breathe become deadly because not under higher atmospheric pressure its toxic to us?
4. How will we handle the NEW ORBIT we will be in now? Will it change the climate so we cant live here?
and on and on and on.
Again either DOG likes to wing things - he is a bad planner - or just really stupid.