Understood - but to imply they aren't REAL coaches is off point, IMO. And, Bell didn't disagree with the tenets of Rippetoe. Arguably, most, if not all, programs derive from historical precedents - Starr for one. While I have limited knowledge of Greyskull (and many others), it sort of seems like SS and 5/3/1 had a baby and named it Greyskull.
Point being, for me anyway, you shouldn't send a newbie into a hardcore periodized program without a base of strength. Whether that base comes from Bell's recommendations, or Rippetoe's doesn't really matter. You could certainly get started with bodyweight only, but you do need to have a base.
Again, I'm just figuring this out and certainly don't consider myself an expert - just trying to keep learning.