Hmmm that whith the same power level would explain why those 4 dragons are still alive, but it leaves the question how the dragons that were eaten by the 5th generation survived. I mean I think the possibility that acnologia didn't know of the third continend is pretty low, because he had a lot of time to fly around the world.
And the only dragons that came from the past were those that came through eclipse and those all disappeared when Natsu destroyed the gate.
if u guys watched the movie, there was that dragon who lived inside the girl. The other dragons might have done the same and lived the past 400 years secluding themselves from acnologia. Just cuz he had time dont mean he looked around the world for the dragon's population.
Also i think this 3rd continent has its own dragon specimen, and these dragon eater guys eat/ate them. And there is no proof (yet) the dragons who were eaten r still alive.
All in all I like it, but alone the fact that those 4 dragons still exist is strange, because acnologia spend 400 years to kill them all.
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And now there are 5th generation Dragon Slayer who got their powers by eating dragons? I mean what dragons did they eat, how did those dragons survive acnologia? Of course it would also be possible that those new Dragon Slayer also came from the past like the 1st and 3rd generation, but due to the fact that they were never mentioned before I doubt that. Which leads again to the question where the Dragons they ate came from.
What do you guys think?