True.  But I would still allow it, since the chain daiklaive, at first glance, at least, appears as a short daiklaive.  Personally, though, when it comes to Martial Arts, I do two things.  A: take styles compatible with armor (though the meaning of the 'light armor' restriction on some still eludes me).  B: take styles with a number of form weapons.  My problem is is that a lot of the styles I like fulfill A, but not B.  Golden Janissary, for example, is compatible with armor, but only has spears and dire lances as form weapons.  That means if I want to have the style be as effective as possible, I would have to take a dire lance.  Problem is, dire lances are generally less efficient than daiklaives.