i am not getting one-sided here but this video doesn't proof anything,
1 - at 00:08 - 00:09 http://symthic.com/bf4-weapon-info?w=AKU-12
aku has small horizontal recoil as you can see so it's normal
2 - exactly at 0:15 you can see the soldier going to the right there also he was visible on the minimap
3 - at 0:28 - 0:30 he was shooting at his team mate, not at nowhere, i don't know how can you consider this something
4 - 0:32 - 0:33 check this video ,
you can see many shoots missing in spectator but hitting in the actual game ,it's because spectator mode (in all games not bf4 only) has a small delay from the actual game + the delay from ping (he is in Germany and server is in Russia) = what you saw
5 - 0:38 - 0:41 you can clearly hear the gun sound coming from that area ...
6 - 1:14 - 01:17 how does a knife animation proof anything ????????????