Oni can Change Shape into Large giant OR back into true form—but…

@JeremyECrawfordUncaught erratum? MM says oni can Change Shape into Large giant OR back into true form—but true form IS a Large giant. Or does it mean it can Change Shape into OTHER large giant forms, e.g., ogres, ettins, trolls?

— Keith Ammann (@geeniusatwrok) December 2, 2016

An oni's true form is oni. #DnD https://t.co/BhsqQQ0cxF

— Jeremy Crawford (@JeremyECrawford) December 2, 2016