Do we think the showrunners/writers originally meant for this mystery to be resolved before the show's end? Or was it always supposed to remain a mystery? This is one of the few things that's always bothered me about G4. Celestia literally says a born Alicorn is something the land has never seen and then it's just completely forgotten. On a side note, I wonder if any more were conceived in the years between FIM and G5...?