Good news. The replacement for Firestorm on Legends is going to be Wally. This certainly goes a long way towards explaining why he was suddenly out of the picture on Flash both as the actor and character.
On the other hand now they have an even more overpowered character on board that makes the rest of the crew irrelevant. They will I'm sure find some way to nerf him.
"Hey Wally, we know you could run through the encampment and gather up all the missing pieces of the computer in a fraction of a second but we really need you to stay here and fix the parking brake light in the control panel."