That is quite some relevant information. The SU-25 at 10.000 meters with a speed of 400 km/h against the MH17 at 10.000 meters with 900 km/h.
Whoever likes to believe that, , i don't.
The SU-25 does not operate armed on 10'000m. Its max altitude is 7000m unarmed.
At least the radar echo, if not faked, is showing another aircraft. Can be a MIG-29 or can even be anything else.