Already read the N5 games and sources. The drain here in moto x land won't be so much about cores (imho), it'll be about keeping the touch panel alive to detect touches. Cores are easy. TPs are always another story (they take power).
Hang in brother, -- I've heard this on other devices, we've always solved it. The key is the 'it' that runs on 'a core'. Low voltage core is interesting only to the extent it would solve a particular problem. We won't have that problem because we will remove the cycles of interest by low frequency testing for touch. Still working on it, but it'll work. There's no magic in kernels, just crap-work and testing.
As for sticking the TP up for touches, surely will have work to do.
LOL -- building test #5 now, and it's still borked
. Just crap-work, I'll get it working and we'll get it. Never seen something unsolvable with kernels today. Just time to figure it up.