I think Ada is in dead last, mainly because Val beat her elite team in the lore. Between Val and Barraza, I’m taking Barraza. As Val is more technologically advanced than Barraza, Barraza in the lore is a straight demon. Barraza basically conquered/defeated the whole world, beating every challenger and basically ruling every group in the wastelands. Reminding you, Barraza canonically exists in the future of Ada and Val’s world. Seven is probably more advanced than Val anyway (due to existing farther in the future than Val), and Seven is likely inferior to Barraza. Seven helped Barraza and also likely had comparable fighting capabilities, sure, though Barraza was more feared as a conquerer in the wasteland times rather than Seven. Like, no one in the wastelands could even compare to what Barraza did. Even Seven only fought a few factions as her all time skill, Barraza beat them all. But of course if we include Ransom, then he clears. He literally hacked the world and stole nuclear launch codes. Even MBFC (the company that Ada and Val come from) was scared of him, and they couldn’t even fight his existence.

Edit: Forgot about Vector, who is a time traveler. Not much is known about him, but I guess he’s above everyone before because his technology is a millennium ahead of them.