Euron's sneak attack last episode made me wonder if Tyrion is playing the game.
I think Tyrion informed Euron about Yara's route to Dorne as revenge for Myrcella's poisoning.
Tyrion hates the people of King's Landing, the Westerosi siege tactic plays into Dany's sympathy for the people and makes political sense, but militarily it will weaken her army.
Sending the Unsullied to Casterly Rock proves to Dany's allies that Tyrion is serious but for the long game makes sense if Tyrion needed it as a seat of power as he knows its defenses well.
Olenna still has it coming for Joffrey's death, the little shit was awful to Tyrion but that move really turned his life upside down leading to the entire family turning against him, the trial, and murdering his father. Which brings me to...
Jaime. Tyrion loves Jaime, we know Jaime promised to kill Tyrion for killing their father, but with the way the war is going he's not in much of a position to do so. How will Tyrion handle Jaime when they meet again?
Also I haven't read the leaks, Tyrion's probably cucked this season.