Re: [Mirror]
First of all, according to an account written by a Vulpecula of a round in the past and retrieved by Cepheus, Surgeon was not the one who broke Mirror initially. I can't say if he was the one who always broke her after, but considering the pages ended with "We're going to break her tonight even if he won't help," the idea that Surgeon even did any part of her breaking except for standing by and watching her fall to pieces doesn't have a lot of merit.
Second of all, her experiments were not always to amass power. Perhaps that's what it ended up being, but before that...
... I will admit to being biased with the second point.