They are giving us some kind of option to obtain them next season. They didn't say specifically how, but it's coming. Even those of us who have played since season 2 have had no opportunity to obtain them to this point. I was only able to get the sunshot catalyst that season(and I haven't stopped playing the game), so i am waiting for them to return as well. Regardless, if you haven't played since season 2, there should be plenty of other things for you to chase right now lol. We are getting 4 brand new catalysts next week during "arc week" as well per today's TWAB.