#6 is a huge issue, there's just no reason for Johnson to have the original if he was asked by Roger (or DeAtley) to develop some footage. Giving back a copy rather than the original makes no sense - the other way around does make sense if he felt the need to keep a copy.
You may not be aware, but the Den of Geeks podcast on YT interviewed Evans and his partner. Evans (perhaps unwittingly) drops a bombshell: Norm's brother Dave worked with Roger on hoaxes, and wore Bigfoot costumes !. Yes, Evans is accusing Roger of being a serial hoaxer from 1965 to 1972 in Yakima. Ignoring that insult, there's an obvious take from that: Dave did a post-PGF reenactment with his brother Norm in order to mimic what his friend Roger had done. And that's why Norm has the original, because its 'their' work and has nothing to do with Roger. Dave could have sensed a challenge to do what Roger did, or was jealous and thought Roger was hoaxing (and a hoaxer would love to match another hoaxer). That explains why the new footage has so much in common with the PGF. Munns feels it is just too similar to be a coincidence. So either Roger did a rehearsal and then waited 5 months to put into play all the things done in the rehearsal, or Dave Johnson studied the PGF and the following Spring tried to mimic the PGF as best he could. That explains the 'thinner' bigfoot (no ability to convincingly make a massive Bigfoot) and the head that is different than Patty (couldnt match it, did the best he could).
If Gimlin is in the new footage, maybe he was so upset with Roger not taking him on tour and cutting him out of the proceeds that he went along with this reenactment. Not a wise decision in retrospect, but perfectly understandable. And if its not Gimlin (doubtful to me), then it further distances Roger from having anything to do with this new footage.