Interesting that Evans states that balls in not good enough for the big lads to get on the end of.
It is an issue but not the only one. It suggests the main policy at corners is ball in for big lad to head in.

Part of our problem is that is the only policy. Corners are hit and hope rather than any design or routine to them.
We don't seem to have any imagination to do anything different: routines, balls to the edge of the area, dummies for someone else to sweep in, cute blocking off of players, pre-determined runs to create pre-determined space for another, pre-determined, player to move into etc.
Just lump ball, hope big lad heads it in.