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

For the 1st Gen, I wouldn't say that the Dragons were influencing the humans in any way, in fact, they actually said that they wouldn't. So the 3 Dragon Slayers coming together is more coincidence for me than anything else. And the Dragon Force is most probably dependent on the element, so you could say it's why how the scales look like their parents, though we've only seen Wendy, Rogue, Natsu and Sting. But I don't think it has anything to do with the Dragons being inside them ...

3rd Gen is 3rd Gen not because they killed their parents, but because they have Dragon Slayer lacrima implanted into their bodies. That is also why I have to disagree with your theory about the 2nd Gen. ... Unless the lacrima inside Sting and Rogue are lacrimized White and Shadow Dragons other than Skiadrum and Weisslogia. ... Or Skiadrum and Weisslogia got lacrimized rather than dying. Either way, I find this very improbable, but nothing is impossible in FT. :D

About the Skiadrum and Weisslogia thing, I'd really love to know more about that. It'd be awesome if your theory or a similar variation turns out to be true.

For me, if Ski and Weiss are really dead, I wonder if that's why Natsu's DF's seemingly tonnes more powerful than Rogue's or Sting's. If that is true ... I call cheating on that fight! ... And that fight would not be as shitty as it seems. :P