good chapter , liked how everyone learned the seal , highlighting Shikamaru and Sakura was also good .
the chakra thing , I guess kishi just wants to do what he wants , Naruto can sense chakra but he didn't make any hints that he sensed them , I think kishi will explain this and say that naruto was draining himself just waiting for their arrival but won't say when exactly did naruto sense their chakra .
I do think kishi is prolonging this , he isn't making obito and kakkashi do anything useful nor is he letting the meetings happen as in Sasuke and Naruto , Madara and Hashirama , I might get burned for this but I though sasuke arriving instead of Minato would have been better just to see Team 7 again although Minato is faster so I guess it makes sense