The old emperor was really good at the uke it's just that a misunderstanding happened and he got really jealous and over come with a great emotion to Monopolize the uke for himself leading him to make such harsh and haste decisions which leads to all the disasters in the past.
Don't worry the Emperor in the present life time will not make those same mistakes but the person in the past that had caused the misunderstanding also got reborn too to do same time thing all over again but our Seme and uke are much wiser now.

i hope the author will also draw why the emperor (the braided one) was like that..