User blog comment:Sky-Dragoon-Twilight/Dragons' disappearance theories/@comment-25111584-20140913122606/@comment-7418318-20140913122829

There is the possibility that the Dragon Slayers might have been drawn to each other on a sub-conscious level. For that the Dragons wouldn't even have to actively do anything, it might just have been an unforeseen side-effect of them hiding in their bodies.