Currently the only plot point unresolved from the flashback is the bit about the ‘Spy/Traitor’, so I think we’ll be getting that revealed and also be seeing what happened to the scabbards that infiltrated Onigashima in which we’d see the majority of them killed off & then one or two captured. Can’t imagine Orochi will spare them given he’s wanted them gone for so long.
I think the above needs to be resolved before we see the counter attack from the alliance. Plus given the timeline, the above most likely comes first. We still have to free the Captured Samurai in the Capital & have all the armies rendezvous before the alliances marches on to Onigashima.
Also if Orochi kills off some of the scabbards and thereby any hope of retaliation towards him all the whilst thwarting Toki’s prediction (in his mind at least). It’d give the SHs & the alliance the chance they need to get a jump on Orochi & Kaidou.