Considering the eclipse was a merge of a forbidden magic of Zeref with celestial spirit magic,I was already expecting that the gate was the link between Zeref and her,ever since the GMC arc. Man,it took two or three years to see this theory taking off. I was already expecting that any damage the book suffered would be transfered to Natsu. I was half expecting Zeref's death to mean Natsu's death since Zeref was the one who reanimated him.
What disappoints me,however,is that E.N.D never really created Tartarus. Mard Geer simply found the book and then used the book to spook the other etherious into accepting him as their leader. How did he create curses and how Igneel attempted to kill him then? I imagine this will be chalked up to Atlas Flame's piss poor memories and that Mard Geer was lying through his teeth.
Hey,Mashima tends to draw the women pretty much the same. Only some minor details like face shape,eyes,size and breasts help differentiate,lol. The last one was a joke. It would be rather random to bring Hisui into this,that's why I think you might be mistaken.