You guys think he could be the bastard, Aegon? Or do you think it's too late in the show to introduce a new big player? And if he turns out to be Aegon, do you think he will be a pro about it and work for Cersei against his kin? Or did he work his way up in Essos with the purpose of invading Westeros at some point anyway? Could he know about his father's actions and basically hate every faction?
Drax the Legend, Captain of the Fist, The Starwalker, The Jade Slayer
Way too late in the show. It would only water down Jon's revelation of Targaryen heritage. And there's way too many characters to deal with in six episodes for them to introduce another one now.