You punks complaining about Lubu only using one hand are ignoring the story, or didn't read. His greatest strike was made ONE-HANDED, with the centrifugal force and all of his concentration involved.
Which means he'd used two hands and got weaker strikes. His best was one-handed, gripping the polearm like a lunatic.
None of your "If he'd just done it this way." matters, because canonically YOU ARE WRONG.