User blog comment:Omega natsu2/Chapter 385: Spirit King vs. Demon King, Predictions./@comment-7418318-20140527171131/@comment-4829046-20140527174530

That is what it seems to be leading to. Or it could be that the humans altered. Maybe it changed Il Illah(magic) concentrations. Instead of receiving equal amounts, some got high concentrations while others got lower. The ones with higher have capacity for magic and as an added bonus get to see Rukh while others(Goi) don't. But then again, maybe this is also part of it. All dungeon capturers must be goi right? The dungeons were part of Solomon's process. To distribute magic via residents of the previous world(Djinn) Maybe this will be resolved once we see the creation of the dungeons and the binding of Solomon's elites to each one.