User blog comment:Sky-Dragoon-Twilight/Dragons' disappearance theories/@comment-10058473-20140913140247/@comment-24784846-20140913140744

I wouldn't be surprised if Skiadrum is in reality mad at Rogue for trying to kill him, and if he is inside Rogue, then thats who "Shadow" is (takeover dude from Gajeel vs. Rogue) he overtook Rogue's body in the future and killed Frosch. But thats just one of my theories