Since “Aegon” isn’t in the show and won’t be (not this season and they gave Jon Connington’s stoneflesh to Mormont so probably never) I think he’s probably a fake who won’t have much relevance when all is said and done. I don’t know who’ll ride the 3rd dragon though if not him.
The show will start spoiling the books now, lol.
Being heavily spoiled didn’t dampen my enjoyment watching (or reading) though.
I expect you are right about the show writing out Aegon, but it’s a big disconnect. In the books, Jon Connington and Aegon get the Golden Company to Westeros and open the War of the Targaryen Restoration while Dany is still wandering around in horse country. Since the Golden Company is composed of exiles and the sons of exiles, its participation implies a network of potential supporters in Westerous and scrambles what we think we understand about the politics of the great houses as old Blackfyre connections are revived. The show (and for all I know, Books Six and Seven) may dispense with all that, but there is a lot of potential there that is being left on the cutting room floor.