So, rather than wasting precious time and energy fighting him, I figure we ought to just let him go and work to save him from here.

Ha! This is so true. I am so in love with your Master. The whole conversation about teaching parallel quark alternator geometry was just perfect. Right now I'm hoping your Master reforms and starts traveling in the TARDIS with them. Improbable, I know, but when it's done right, it's just awesome.