I am sticking to the idea that Sahure being close to Re represents Mercury. The spiritual body might relate to lightness and Mercury is a small celestial body. On the other hand I don't know how it can relate to Orion - Sah. Another explanation regarding the kicking apart from the retrograde motion is the fact that being light it is more susceptible to gravitational forces especially from the nearby Sun. Thus this could relate to its large eccentricity. Forces "kicking it off" an ideal circular trajectory.