I don't know much about DCD, but it does sound to me like some executive function problems are there. Kids with executive function problems aren't simply being lazy/forgetful, the part of their brain responsible for considering consequences and planning ahead is simply not as developed/mature as other children their age. In ADHD there's a common thing I've read referred to as the 60% rule. IE: If the child is 10, expect them to have the executive function of a 6 year old. I would try and see if you can have his IEP address these issues (some accommodations I've head of are having the teachers either review the child's assignment sheet, or email assignment info, allowing the child to email the teacher assignment or homework, allowing an extra day to turn in work, or to return to a locker to fetch it. That sort of thing.)
