yep i dont get it either -_-, this past events are so confusing for me i don't know who's who, what's the role of them etc ... it's like reading new manga from late chapter, skipping the begining ....
What's not understandable? That guy was clearly the one they are looking for in the previous chapters and those other guy were some sort of minion or something. Which means that saving-id-thing was planned by them in order to gain trust from Id and Ook Bing.
