Probably because they have a greater command of the English language than you would appear to possess.

He has great command and presence on the football field and is a team leader.

Not to mention that I'm fifty years old, which is far too late into office, an age thought beyond great military commands.

"Peyton Manning has great command of the team and the game."

Now here it was at last, the great command he had dreamed of.

He didn't have great command tonight, but that even makes him harder to hit off.

The human must be a druid, for she had great command over the forces of the goddess.

He had great command of his voice and knew how to use it.

He is said to have had a remarkable memory and a great command of languages.

But it does have a great theatrical command of space.