Hyperveloce
The altitude variations (unless they are well beyond those of a controlled aircraft) do not seem to impact the doppler profile significantly.
Well, altitude changes produce speed changes. Climb or descend will produce different speed delta / doppler, lower altitude cruise will produce less groundspeed and thus different speed delta / doppler.
Therefore it has quite significant effect on those computations.
Hyperveloce (bolding by me)
That's true again, we know nothing between the handshakes and we have to make assumptions like trying to find/fit trajectories with minimal speed or bearing variations.
Thatīs where i have the most reservations against those theories. While a southern routing by deliberate human action or by autopilot with the human factor removed would fit straight track and constant altitude, the northern routing with human input would look quite different in order to avoid continueous detection threat, and that would have to include changes in track, altitude and thus speed.
Therefore in assuming a constant track and speed the northern routing is excluded by this assumption itself.