...Aren't these the same people who are constantly bashing Sakura? I cant even...
As for the second bolded, the fact that that was confirmed in that particular arc is important. The time couldn't have been that long ago, what, a couple weeks? I think that whatever Naruto and Sasuke feel about Sakura is not going to change in that short of time, if that makes any sense. Naruto can't possibly get over Sakura in that short of time, given his characterization and the fact that Naruto was confirmed to have feelings for Sakura 3 times in a row. And Sasuke changing his feelings would make even less sense.
Sakura, to me anyways, seems to have been changing ever since Sasuke left, as her feelings for him are hurting her, while her feelings for Naruto are growing.
The total time frame between pain, the reunion, and start of the war is left ambiguous. I mean the recent filler at the start when Naruto came in KCM to the fight with the filler samuari, that cloud girl (forgot her name) she said I saw you yesterday.
Okay aside from that, well there is really no direct given timeframe, it had to be a couple days to at least 2 weeks for the villages and Akasukti to prep for war if we want to be reasonable. One thing I don't mind about Naruto fillers is that tend to at least put themselves in small areas of time where it makes sense to run along with main plot. I mean like how there was a small time of frame between some arcs that allows the anime team to do this. In terms of canon though, it would be impossible to think Naruto would just change in an instant, that's an inconsistency with his argument of just changing from Sakura.
When it comes to fillers in this show, they at least have effort to put them in small places that still make sense, thats better than what Bleach did with things going off chart.
Fillers which take place in part 1 are generally inserted here:
-After land of waves but before chunin exams
-After tsunade returns but before Sasuke leaves
- After Sasuke leaves but before Naruto leaves with Jiriaya in the 3 month time frame-most naruto media basically uses this as the golden spot for their stories in fillers and settings for some of the games due to the wide range of time, its non-canon but still not a bad move to put a setting for it.
For fillers in part 2 they actually made most run with the series:
-Sora arc between Sasuke and Sai and Hidan and Kakazu
-3 tails arc between hidan and kakuzu and itachi pursuit
-Uktaka's filler arc shortly on the way back from failing to get itachi but before the news of Jiraya is told
-Konha history shortly right after pain-what I like what this arc did was actually give an illusion that a couple days could have passed before the 5 kage summit commenced
-chronologically after the 5 kage summit arc came the chikara arc (a mission for team 7 while the village preps for war and still rebuilds) then the adventures at sea (gave another allusion of some time to pass)
I at least find it good that that fillers gave some illusion of time, makes better sense than the village magically being rebuilt within a week. Had to be some carpenters to rebuild the village that fast unless Yamato went into overdrive to put a lot more buildings in. (oh poor yamato be is nothing but a great source of lumber in that time)
But yeah if not much time passed, that cannot mean so much changed at once. Its been 3 years in real time for the war, only 2 days though of actual fighting. This meant Naruto gained KCM in the first day, on the second he became that super form. Not much is going to completely change.