re: Receding Hairline - Shave it all or keep cut short

My husband's started on his crown and the hairless crown is growing. (I cut his hair) His combover isn't ridiculous, but it's longer than the rest of his hair. And his hair there has changed texture with time and is both sparser and thinner.

He will never be able to shave his head totally, because he was in several accidents and has some hellish long scars on his head. Currently hidden by hair. And kinder to the rest of the world who would be grossed out by the length and irregularity of the scars.