Everyone remember that big evil guy...Reverse Flash? If you all remember(how could you forget?) back in season one and even a bit of season two Reverse Flash was basically the ultimate enemy of Barry. It seemed, at one point, as if almost every single episode had to have some sad day reference back to the Reverse Flash with it either coming from Wells dealing with his shared identification of Evil Wells or Barry coming across something that reminds him of the Evil Wells. The Reverse Flash had a yellow and red suit in opposite to Barry's red and yellow.
Remember the first female speedster to show up on the Flash?
Trajectory! She may have only lasted one episode but she sported speed that, for a very short time, rivaled The Flash. As most of us know she got her power through the use of Velocity(a speed drug) which created an evil alter ego akin to that of Zoom which inspired an intense need to continue taking Velocity. The episode ended with Trajectory taking a very large dose of Velocity, her speed turning from gold to blue, and just running into dust leaving her red suit behind and everyone kind of like "That happened...next episode I guess...."
How does all of this come together?
Okay. We now have two speedster suits. One red for a female and another yellow for a male. In the last episode we saw Barry go poof after going through a second particle accelerator explosion and when we saw what looked like his speed rush through both Jesse Quick and Wally West most of us assumed this was the moment both of the iconic speedsters acquire their speed. Back in Young Justice(RIP) Kid Flash(Wally) was wearing a yellow suit instead of the metallic looking one seen in more recent days.
My theory is that in the final episode we will see Barry return from whatever the hell happened to him, see Wally dawn the old Reverse Flash suit, and see Jesse Quick dawn the old Trajectory suit. If I am right we may see the three speedsters team up to win the final battle against Zoom.
If the fight is won we may see Jesse Quick and Earth-2 Wells return to Earth-2 to rebuild the broken world. So the Season 2 finally may be the only episode where we see the female speedster unless they do a "Jesse Quick" series over on Earth-2.