Your numbers 1, 3 and 4 are correct.
As to number 2, the Power Winder N works fine on the PRO, and most likely on the PRO-TL.
The very few incompatibilities within the system tend to occur when some of the newer accessories (designed to be used on the PRO or PRO-TL) don't work on the Super, but generally the Super accessories work on the PRO and PRO-TL. The best example is that at least one of the AE finders for the PRO doesn't work on the Super.
The only Super accessories that I know of that don't work on the PRO involve the electronic trigger for the shutter - the connectors for the left hand grip differ, and the converter that allows use of a manual cable release differs as well, mainly because the shape of the bodies is different in that location.
Matt