ThirdWizard
First Post
Plus its a nice catch-all in case they ever make a double weapon that is medium sized, er... two handed but can be wielded in one hand. Just in case.
This is the quote you say is relevant. But lets look at it more closely.A creature wielding a double weapon in one hand can’t use it as a double weapon-only one end of the weapon can be used in any given round.
This raises the question of *who* meets this conditional. *WHO* can weild a double weapon in one hand? Everybody? If you say weapon and weilder size doesn't matter, than we are back to the grig using the Huge double axe; and that is patently absurd. So we need to look at the rest of the rules to see who meets this conditional criteria.A creature wielding a double weapon in one hand

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.