In general, I thought that objects intended to rendezvous with the ISS would appear to approach from in-advance, rather than from the rear. In order to "pursue" the ISS, it would have to first achieve ISS-orbital-velocity plus overtake-velocity, which will clearly consume more energy. By initially positioning itself in front of the ISS, it only as to achieve orbital velocity as the ISS catches up to it. Similarly, on undocking, it will appear to lag the ISS's orbit.
Obviously, I'm not the proverbial scientist .....