The Huskar Social Union wrote:This is essentially the war at this stage
Black: Targaryen/North
Red: Lannister
Grey: Neutral/effectively out of the war
And you can pretty much discount Dorne and the Iron Islands at this stage too, i would be very surprised if any Dornish Soldiers showed up for the attack on Kings Landing, or if Yara showed up again.
It will be a mix of Vale/Northern and Unsullied/Dothraki vs Lannisters/Iron Fleet/Golden Company
Don't the Lannisters control the Reach too?