Board Thread:Manga/@comment-24930713-20150810080743/@comment-5774380-20150818203623

Neetaku wrote:

I'm glad you brought up whether No Regrets is canon or not Manuel, because I've been meaning to note somewhere (didn't know where, and that's why I haven't brought it up until now) that No Regrets, which shows the Survey Corps implementing Erwin's new Long-Distance Scouting Formation under the command of Keith Shadis, has been rendered non-canon by the events of Bystander, which recounts how Shadis rejected Erwin's Long-Distance Scouting Formation.

Actually, that's not necessarily true. We know that Keith rejected Erwin's strategy when Erwin initially proposed it, but he could have been convinced later after the continuous casualties that his squadron was experiencing, while Erwin's squad wasn't losing any member.

When Erwin proposed the strategy, Levi was nowhere to be seen, and during the events of No Regrets he had recently joined the Survey Corps; that suggests that No Regrets could take place after that part of Bystander.