It says in
Mysterious Akavir that Tosh Raka, leader of the Ka' Po 'Tun, became a dragon. It claims that he has black and orange scales. But how did he BECOME a dragon? Is he Dragonborn, and simply learned Dragon Aspect? Did he tame a dragon? Was he a dragon all along?
Also, it said that the Ka Po Tun plan to invade Tamriel once they beat the Tsaesci. Well, it's been over 200 years...something else must have happened because this invasion is long overdue!