Dean was more responsible for those guitars than Dimebag's napkin sketches ever were.
His Washburn stuff was equally tasteless (stripper girl camo, rebel flag, tacky flames, cutout flames, lightning bolts over all kinds of bursts, tacky "horror" graphics, etc.), so I'd bet that it was more Dime than anything else since it was pretty much the same guitars no matter which company he was with at the time.