There is a possibility of 2 ganons and believe it or not, it is very possible that FSA ganon while sealed in the four sword exists at the same time as OoT ganondorf.
SS opens the doors for the entire FSS series to go between it and OoT.(what im about to say doesnt prove this, but if you want it, ill give you an extensive argument that can support that claim.) In FSA he is sealed in the four sword. In OoT a new ganondorf is born (Kings share names) and is killed at the end of TP(CT) and WW(AT). Four sword ganon somehow escapes the FS seal and is killed again in LoZ in the AT and in alttp on the (CT) with a failed revival by twinrova in OoX. In FSA he is pig ganon, as he is in OoX, alttp, and LoZ. Also, by having FSA before OoT it allows for the Gerudo to finally share a place in teh timeline without randomly reappearing out of nowhere. The only 2 games that feature the race are now together.
This makes it possible to finally have the right number of ganons and no more screwy revivals that arent backed up by canon backstory.