I noticed the dark hair — with just a touch of gray at the side-— to give him the look of the wise leader.
He changes color to go with the moment. Fake is as fake does.
The gray look was to garner sympathy as the sacrifice he is making, turning him into an old man, for the children.
When you wear it that short, you can go gray in 2 weeks and back to black in 5 minutes, LOL.