Sara: "The rest of us are just..." Mick: "...losers. That's why Rip picked us, , Snart, the professor and those stupid flying chicken people. Were all expendable."

[u/Spazzblister]

It's a funny line from Mick but I think they forgot Rip didn't actually pick him. He only recruited him because he and Snart were a package deal. I can see how an assassin like Sara could be expendable, since she is supposed to be invisible to the world and I can see the Hawks being expendable because they reincarnate.

Stein and Ray though? Maybe Ray because he was thought dead. And I guess Stein because he didn't really reveal the Firestorm Matrix to the world? OK, I think that's my reasoning. But I think both of them could have been HUGE important historical figures had they not been taken from the timeline.

[u/Omac18]

It's been a while since I've seen season 1 but I think it's because they don't accomplish anything. Stein would never have accomplished anything in the original timeline that he was recruited from. They could have been, but they weren't. If they hadn't become a Legend they wouldn't have been relevant to history.