Even though I previously postulated it might be future Barry, it stopped fitting for me with KF's "oh my delicious teddy bear steak YES I'll join you" reaction. It was going to take some major crazy for future Barry to kill Iris, anyway, but KF totally made me disbelieve the possibility.
I didn't get that sense of her being pleased or delighted - or overcome with
any emotion - at all, at the revealing of the suit's occupant. But her stunned surprise at who it was, coupled with her willingness to join forces, could well be explained by its being future Barry - or someone whom Barry trusts implicitly, and who knows him well enough to truly screw him over. (Jay, maybe, driven mad by the Speed Force torture he willingly took from Wally?) She did say, in the future, that she's mad at Barry, because his Flashpoint-repair attempt gave her unwanted powers (and a split personality, apparently).
The big drawback to its being a future Barry is that Savitar wants, ultimately, to kill Barry - but he'd be killing himself. Maybe a parallel Barry as Savitar, then, but why the vendetta, in that case?
Another question is, what would future Wally have seen that drove him catatonic? One possibility is an alarming reveal of who's in the suit, but who might that be?
I'd been thinking that the episode ruled out, as Savitar, everyone whom our Barry met in the future, with Savitar imprisoned in the Speed Force. But Savitar's undoubtedly from farther in the future than a mere seven years, so that makes it still difficult to figure out who's out of the running, and who's still in play.
