I am impressed.

As your figure shows for normal rolls and low angles of attack with no elevator or rudder input the airplane initial roll acceleration is about the body axis but as the roll reaches steady state conditions (which is fairly quickly) the angle of attack is stabilized and the roll transfers to the velocity vector (of course with no elevator or rudder input the airplane comes down due to gravity)

When we do our rolls and input rudder and elevator we are forcing the airplane to roll about the body axis, which is hopefully at a low angle of attack to look really good.

A typical light aerobatic ship that will do high angle of attack (70 degrees or so) and hovering maneuvers can be seen to roll about the body axis in the maneuvers. In that case for a roll to the right that goes from 0 to 90 to 180 to 270 to 360 the angle of attack goes from 70 to 0 to -70 back to 0 and the sideslip angle goes from 0 to 70 to 0 to -70. Also the elevator is constantly moving to keep the airplane from transferring to a velocity vector roll.