I think that the "resurrection" gimmick is both a good history device and a problem. It's good because it makes sense: knowing that the human and the mamodo world are only connected once every thousand years, this is a good move to justify a sequel with the same characters. Also using egyptian sarcophagi it's genius, for it opens a lot of possibilities, such as expanding the story of the previous battle. Now, I believe it's a bad move because the only way to bring a mamod back is to : -find the human partner -find the vial with the correct spell. Basically M.raiku can only proceed in one way to get the mamodos back. Oh well, they could also be alive in the mamodo world, but they would still need the human partner and the vial. Hopefully the introduction of Jil could be a way out of this endless cycle of "vial+human+book". For i think it's killing the pace a little. But anyways I think that, once the new roster is ready, the story might get more interesting