Complete?, I don't think so. Valid, interesting and worth studying yes, but complete?... I doubt it.
Btw, arts are not humane, people is and evolution (and its mechanisms) is a different thing.
By complete I don't mean a set of techniques that can handle all and every situation with super human ability. But, rather all the tools needed to draw on. You don't have to go outside the art to get something. If your lacking something it isn't because Aikido doesn't have it.