Hi italia 458
So I'd say the actual majority of the turning is caused by elevator
I'd say all the turning is due to the horizontal component of lift from the wing in a banked turn.
The elevator is applying a downwards force in level flight, and has an outward force away from the centre of the turn in banked flight. To say you think the majority of the turn is caused by the elevator, is like saying most of the lift in level flight is caused by the elevator.
The fin ensures the aircraft has direction stability in Yaw (your weather cock effect?), the rudder (& Yaw SAS) fine tune the slip to zero due adverse aileron drag etc.