For me the “burning question” is how much of Daenarys’ fleet burned. I assume the portion with the Unsullied on the way to Casterly Rock is okay. Though at the time it was headed in the same direction as the Greyjoys, but I don’t really know that.
Also where the Hell are the Dothraki, the bulk of her force, and the ships that carried them?
Finally, a look at the map shows it’s damn long voyage for the Unsullied from Dragonstone to Casterly Rock. Rather than sailing around an entire continent, why not cross overland (it’s a straight shot West), especially when the bulk of your Army is horsemen?