Yes, probably it would have been better to offer all this in the epilogue and not the prologue, though here's what I think RJ had planned:

- Masema gets killed by Faile after the battle of Malden. He had visions/dreams that told him to kill Perrin and got Aram to do the deed. Dreams? Hmmm... Forsaken? Hmmm...

A bit later in the prologue:

- Tylee 20 days after Malden gets attacked near Ebou Dar.

- Perrin, 2 weeks after Malden, has a dream that ends... with a big evil laughter.. connecting this to Masema's dreams. The point that a Forsaken is involved near Perrin is now solidly set. The "useless" TGS scenes don't appear: Perrin was already aware of the Travelling issue, and in KOD he didn't wait at Malden, it's Tylee who remained behind to deal with the Shaido. That no longer belongs much to TGS... so this is moved completely to TOM. No Perrin in TGS.

- Rand's scene, around the same timeline, serves to show us how he stands in the timeline with Perrin, Tylee and Tuon. His story line then jumps a few weeks ahead.

- Mat reappears two weeks after Malden too, and meets Verin soon. This is either in the prologue, or his first or second chapter in the book. He doesn't have a "side adventure", which felt like filler (so did the departure of the AS... only to get back to him early in TOM. What was the point of that, really?).

As this doesn't really belong in TGS, this gets moved to TOM, where Verin's visit serves to tell us this happens before she went to Tar Valon, and.. exciting surprise, there was more to the reveal of the BA and her bringing down the BA.

- Tuon reappears two weeks after Malden. Her scene is late in the prologue, and completes the Tylee first scene and the Rand prologue scene.

I don't think Tor limited the pages for TGS. What more likely happened is that Brandon wrote by POV clusters, and he wasn't done with clusters 3,4,5 when the decision to publish the book in three parts was made.

A lot of the minor POVs that serve to enrich/complete the main clusters (like Rand's, Egwene's) were stacked in the 5th, "misc" cluster. None of that was written at the time.

Brandon would have had to have time to step back a bit, re analyze the book as newly structured, dig into RJ's notes and sketches to spot the secondary scenes he should put in TGS and where, and to write them up. It seems he rather had time only to polish up the Rand-Egwene chapters, to structure them and to come up with new material for Perrin and Mat so they had a few chapters in the book.

I think he had to postpone the first Mat and Perrin scenes as planned by Jordan and come up with something else, because typically the Jordan first scenes kick things in motion and generally with a twist, and he had no place in TGS to deal with that - he would have to abandon the new stuff abruptly after a few chapters, which wouldn't make much sense. Perrin's dream does that. Mat meeting Verin could have done that. Instead, Brandon invented an adventure for Mat, which he could end with him going to Caemlyn, his original first episode. It's very open ended, but the Hinderstap episode had a kind of self-contained beginning, middle and conclusion.. and Verin's letter that was probably the kick off chapter for him became a kind of cliffhanger.

With Perrin he was far less succesful, and for the most part rehashed unecessary things (and created continuty errors). Perrin's scenes in TGS merely brings him up to the timeline of the Galad scene in the prologue, adding nothing new. Masema's scenes aside, nothing new happened, and it really seems that Jordan intended to skip the first weeks after Malden and reunite us with Perrin, now in synch with Galad, two weeks later, with the prologue dream scene that kicks things off: Perrin has a Forsaken haunting his dreams. I also notice Perrin in this scene is going back , as if the minor character development in TGS on this front never happened.

Incidentally, that left only Rand a bit ahead of everyone else in AMOL. Egwene, Mat, Perrin and Elayne would all have been more or less synched, which makes sense because there was a lot more to happen to Rand mid-way and if Jordan didn't go a bit ahead with him, he would have been stuck with a lot of Rand in the middle-book. As his story line stays disconnected from all the others (but Tuon's) until DM at least, this wasn't a problem.

Evacuating Perrin and Mat totally from TGS (where they added nothing, beside giving a little bone to their fans to chew on... and not a very deeply satisfying one when you look at it... Verin's letter was the only big highlight of the whole thing...) would have left Brandon space and time to polish TGS off a bit more more, and to add secondary scenes from cluster 5 that, seemingly, will now appear in TOM, out of place in the chronology. More Graendal to flesh her out as the threat in Arad Doman, with the climax of her escape.. bringing back Alviarin and Mesaana and flesh out the BA hunt before the dual climax of the purge and the escape. Just a few extra scenes (or background tidbits in the existing scenes, even) with the BA hunters in the Tower (wrapping the Alviarin looks for them, and they are closing on Alviarin storyline), a few mentions of the Sitters working with the AH before the very flat reveal at the end. It would have made TGS quite better IMO.