if you ask me, there sellouts, think about it.
you know the dragonball movies battle of gods recently, they only had a KFC ad in japan,
and there doing marvel, why cant they stick to manga for there anime, then again they did great jobs with the count of monte cristo, and romeo X juliet.
maybe there trying to get people who likes marvel, an old literatures ect who dont know about anime to get there attention of the things they like e.g marvel, old literatures, ect