Would you say the CPR chapter (the number of which I have forgotten) was also like our 615?
(Also, how is Sasuke catching Sakura in an awkwardly drawn page count as SS's 615?)
No I do not count that because, that chapter showed Sakura's dedication to helping Naruto, furthermore her efforts in trying to keep Naruto alive paralleled with Karin doing the same for Sasuke.
I associate 685 with 615 because SS fans were say that Sasuke catching Sakura was proof that SS will be canon, just like NH fans were saying that Naruto holding Hinata's hand was proof that NH would be canon.