Your first problem was listening to a guy on You Tube who sounds like he just got out of puberty. I didn't bother to look at the rest after that. Responding to that clown, BUK missiles by the way explode in proximity to their targets and shred them with material, such as steal balls. It's not a direct impact. The big difference between that an a gun is that the damage is catastrophic, tearing most if the plane apart, which is what we saw. Furthermore, the SU25 is physically incapable of doing what the Russians claim it was doing. It's a ground attack plane.
That is, physically incapable of it UNLESS air traffic controllers on the same team had vectored the target craft into some sort of a killing bottle and THEN put the 25 straight down on top of it.....