The 80D is a really nice camera and a good overall value. The 6D2 has 2 major turn offs for me: AF points clustered too much in the middle and low ISO dynamic range. The 80D checks both of those boxes plus it has a good frame rate, high pixel count, and flippy touch screen.
It's my understanding that phase detection AF on FF cameras will always have the focus points concentrated in the middle 1/3 of the height of the frame. Width-wise, there isn't the same physical limitation, but perhaps there are implementation restrictions.
We're a Canon/Profoto family: five cameras, sixteen lenses, fifteen Profoto lights, too many modifiers.
It's my understanding that phase detection AF on FF cameras will always have the focus points concentrated in the middle 1/3 of the height of the frame. Width-wise, there isn't the same physical limitation, but perhaps there are implementation restrictions.
The AF points on the 80D and 7D2 cover the rule of thirds points. I'm not sure about the full frame cameras, I've never looked because I couldn't ever justify 5D and beyond cost.