Calculating Torque using Steiner Theorem?

[tomliu93]

I am going to do some structural analysis of the wing. The upward shear force, or lift, is acting at the aerodynamic center. There is also a moment about the a.c. I am just wondering if I need to take the moment relative to the aerodynamic center into account when I calculate the torque about the shear center?

 

[strive]

The shear center is in the a.c.
Use the Steiner theorem.