Great post.. The two issues -- internal slipping on the insole and rolling need to be separated, obviously. I have a bad knee (partially torn ACL) and abused feet. My big toe on one foot was broken severely about 20 years ago and the joint is destroyed. Needless to say I get a LOT of pain in my big toe if the shoe is too restrictive and my knee starts to complain if the shoe rolls at all.
Going from a traditional running shoe to a zero drop I immediately noticed a couple of changes physically. First was my knee stopped hurting after running. I suspect that since my foot was hitting the ground squarely and not wobbling over a cushioned heel it wasn't being tweaked laterally. The pain in my big toe also went away as the toe box was large enough to accomodate the room it needed.
The knee pain returns immediately if I run in older running shoes. If they have more than a couple of hundred miles on them, they're too soft and the foot rolls over the sole. This problem is nearly impossible for the minimalist shoe. Even cutting and turning, there's no elevation to speak of over the sole and you're basically sandwiching foot to ground via a thin patch of rubber, so I found that I'm not rolling over the sole.
INTERNALLY, I could invision a big guy moving around in a minimalist shoe if they didn't snug nicely. Certainly the sock/ insole interface could have some movement, but I would be inclined to attribute that to fit. Certainly the two issues are connected....