Arguably, putting them in the roster was a retcon* : the original team's whole concept was to “give the others a chance to shine”.
* though not a blatant retcon, in that it was done by adding to history rather than by changing history. I'm referring to the story added during the Bronze Age revealing that the first meeting of the JSA was actually predated by Superman and Batman getting together and deciding that the JSA should be founded. I prefer that story being ignored (it didn't really bring anything useful or interesting to the table), and going back to the JSA being founded by the group that met in All-Star Comics #3.