User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-4421067-20130115165040/@comment-4212769-20130115165305

Both is right. As Tri hadn't the chance to bring the companions in they couldn't but in MH3U they are also able to go there online. And it's limited. I saw it at the Let's Play of MHVuze who also explicitly said that it is like that.