He sounds just like one of my Cubs, and their mothers could be twins.
Although, my Cub is on medication...it just takes a while to kick in! I think my little friend's behavior is largely outside of his control, though I never see his parents intervene, either. I don't know them well enough to truly say (they're in our pack, but not our ward). He's a nice boy at heart, and we always try to appeal to his better nature.
I'd ask for a team teacher, so that one can be the kid wrangler while the other teaches. I do suggest that a man be the kid wrangler - my Cub responds best when it's a man doing the disciplining. Having a second adult there gives the adults the freedom to send one out with the boy while the other makes sure the rest of the class receives instruction and doesn't miss an activity on account of the one boy.
The other thing for your DH to do is to be sure to get set apart and to pray for this young man. Your DH has the right to inspiration on how to reach him and the rest of the class from the One who knows him best.