The most reasonable interpretation of this single, limited quality photo is that it is a helicopter. Your counter that local flight rules preclude it from being a helicopter is not convincing. You have not excluded the possibility that the pilot was not following the flight rules or had a waiver, and you may be wrong in your speculation of the flight rules themselves. Extraordinary claims require extraordinary evidence. If you think you have something extraordinary here, then you require more than this photo. Occam says helicopter.