Cloud flat vs Soft Squat and Vertical Hook vs Hook Curl?

Correct me if im wrong but a soft squat will kind of squat about 5-7 yards and guard the flat like a rb in the flat and also guard a corner route? So they are kind of in the middle of the flat? 

A cloud flat will guard higher up on the flat for instance they will be better to guard a corner route instead of the rb going to the flat?

When it comes to hooks what's the differences between the vert hook and hook curl?

Vert hook will man up any vertical routes and if there are none they play like hook zones. Hook curl plays hook zones then go to curl area if no one’s around. This is assuming you have match on

Anyone know what zones are included in mid zone knock out? Is it only greens?