If he would have glossed over the Rocks' part of the original Harald/Loki flashback I'd have said that he only goes for clashes, but now he really portrayed the full Rocks' journey basically, pulled out character interactions, set up that Shakky plot and even the WB assuming a traitor plot, hence I really doubt he's going to pull up some ch.1096 pages again, where everyone enters the island, and then just add 2 pages of clashes.
Teasing =/= real build up, that stuff we are currently getting.. I think he intends to go for the full thing tbh. I highly doubt we will ever get back to it. Setting it up in order to gloss over it, makes no sense. I think atleast 3 GV chapters might be realistic. I think he will establish the main fights quickly and then will resolve the plot lines with scene jumping: 3 pages here, 3 pages there, big 6 gets more screentime, everyone else less and the big finale is GV getting erased.
It's really not that deep imo. No need to hide the abilities of a guy like Silver Axe if we will never see him again anyway, same goes for everyone else. Just establish their abilities and powerlevels and be done with it. The final war is primarily made up of the mid and new gen heavy hitters, thus no old legend still needs to be hidden.