Is the resultant field of a three phase wound stator always two pole?
I believe that the diagram shown below is what is described in the question. If the coils are positioned and connected correctly, you have a two-pole or a four-pole motor as shown. Six coils could be connected differently to make a two-pole motor. In either case, three phases result in a rotating magnetic field. The field has two or four poles depending on the winding. The shape of the magnetic field in space at an instant in time is something like your animation shows for a two-pole motor. It is like a rounded trapezoid. In a real motor design, there are more coils per phase distributed in more slots to make the shape of the magnetic field more sinusoidal.

Image from Fitzgerald, Kingsley, Umans, Electric Machinery, 4th ed.