Primal is a brand, paleo is a range of things to different people (high fat, moderate fat, low carb, starchy veg filled). It's in Mark's interests to market it as something different but it ain't. The other lifestyle aspects were covered by others in the paleosphere prior to here. Not knocking MDA, it spreads the word very well, but the difference is packaging.
The trouble with the rat race is that even if you win, you're still a rat.
I take life easier than almost anyone I know, but when I exercise I do it as though my life depends on it (which it does).
(Arthur De Vany)