It seemed like these new heroes were to replace the JSA...
...but, they were also related to the Justice Society.
Jennie-Lynn Hayden had found her brother, as both she and Todd had been adopted, ending up with Julian and Myrna Hayden, with a quite suburban life...until she started turning green here and there, which can be a problem! Jennie-Lynn used this ability to find her brother, and the two showed up at JSA HQ when the other four future Infinity, Inc. members did.
Jesse Quick (being sort of a female Flash/Green Lantern team).
ObsidianGolden Age ladies here!).
Deadshot and Merlyn as members), then worked with Manhunter Kate Spencer for a bit, as well as fighting his darker nature (which at times made Todd a villain, usually due to the influence of Eclipso).
Brainwave, Jr. crashed the party when the other future Infinitors crashed JSA HQ, and he ended up tagging along when Ultra-Humanite sent the other six back to the 1940s (to fight the All-Star Squadron), and it was Brain Wave, Jr., who, along with Tarantula who helped save the day (and more importantly, saving Albert Rothstein's mom....so Nuklon could eventually be born!).
Star-Spangled KidSeven Soldiers of Victory, the All-Star Squadron, and after some time-hopping of his own, even joined the Justice Society of America. But Sylvester wasn't happy as a JSAer, feeling the need to leave the team and wanting to establish a name and direction for himself.
Power Girl and HuntressPower Girl survived the Crisis On Infinite Earths, and Huntress....well, not so much.
Still, they were Earth-2's next generation of Superman and Batman, and though they weren't in Infinity, Inc. much, they were still charter members.