Okay, he can teleport the staff, with any change of orientation he wants, as long as it finishes touching him...
He can teleport himself, with any change of orientation/position he wants, as long as he finishes touching the staff...
This means you can't really take the staff away from him, so it isn't a focus... It also makes him extremely mobile in a hand-to-hand combat... It also isn't possible to pin or immobilize his weapon, and he can get shots in from angles that would otherwise be impossible...