I assumed Tyrion is taking on the role of my boy Barry. Even in the books Barriston acknowledged that shadow deals wasn't his strong suite so now they have a character who does have that character trait. Dany will marry her dude, she'll fly away then Tyrion will be left in a similar capacity of Barriston where he is forced to be there because Dany ordered it but the new king don't give a fuck about him.