I'm not an expert on gimbals but this video shot on 135mm zoom is quite amazing.
The Nebula 5100's 2.5kg weight limit is a strong indication of a torque that is more then capable of steadying a 80D to such an extent.
[video=youtube;QKTpqLOpLRM]https://www.youtube.com/watch?v=QKTpqLOpLRM[/video]