Bearfoil,
The Fin is meant to split the airstream equally,... he adds Rudder, which truly turns the Fin into a wing, by adding Camber.
Adding Rudder will turn the Wing into a High Lift Wing (It's like setting Flaps).
But even without application of rudder in still air the plane would return into straight flight albeit slower and with some oscillations.
The LE has second most, and the rest of the assembly for purposes of discussion has nil.
Actually the drag coefficient of the fin from LE side is the lowest of the hole thing. That's the main reason why an airfoil profile is used for the fin.
It has the lowest Cd of all shapes.
Shall I construct an honest model and drop it from the second story of the asylum? Wager?
Good idea !!!
Make it from solid foam, round of the LE nicely with sanding paper and grind down the TE, so it's pointy.
Dropping from 2nd Floor upwards should give a good idea about behaviour.
I venture to guess it will tumble aound all axis and fall relatively slowly.