By that logic we should have gotten Jecht or Sin or Yu Yevn the year we got FF X stuff from fan fest. 4 isn't the only FF that has plot revolve around the moon. Course we did just have a love letter to said game via the current 8 man raids. I also wouldn't call Hades an iconic FF boss as they only started to show up til late in the series. DoomTrain would have a better chance as being labeled as Iconic.