Johngreenacrehow come everyone does them different then... its an off axis 7 thrown back... you can do it flat or inverted or in between... or you could barrel roll the first 3 then corked the second or the opposite. Watch some edits, they're all slightly different.
Flat = Flatspin
Inverted = D-Spin or even Rodeo
in-between? = Bio (A forward corking non-inverted spin.)
With a barrel roll (Lincoln Loop) = Underflip/Overflip
None of your examples are corks.
They all look different because some people can cork 'more' than others, Some people have different body positions throughout which can make it look different.
As has been said, there is only one axis for a cork.