It'd be interesting to see how much of an effect lag has too, especially since we're talking about observing some pretty time-specific aspects. I wonder if we could verify it by comparing films from the pilot's as well as the rider's perspective?
Due to lag, the "pilots" plane shouldn't be where/when the "rider" see's it, and neither should the "targets" plane. We'd be talking about three similar but different realities, instead of the normal two (assuming a 1 v 1 fight).
I'd expect it to be worse than what we see in regards to the collision model. It'd be from the third person's perspective.
When I've ridden along with other pilots, I've been able to "see" the time-distortion that lag throws into the equation. The pilot's maneuvering and firing and the associated kills are oftentimes (always?) a bit off.
I'd think that learning the specific timing of firing/leading especially, and throttle and flap manipulation to a lesser extent could actually be adversely effected by trying to learn it as a ride-along, even if it were possible.
I think ride-alongs can be very valuable in a broad sense, but I doubt it in a fine sense.
I know that when I give ride-alongs, I try to "narrate" my control inputs and firing to give my back-seat rider an idea of what I'm up to.