Do not forget the cabin crew: they need time to
Nearest suitable: what does it mean?
Suitable is obvious = adequate and wx
Nearest: Is this time related or distance related?
For twins the time factor has a bigger bearing on the available options than distance.
Anyway you need to get ready for a new approach and so does you cabin.
And all this may make more than one airport a nearest suitable.
Now returning to a field with a lot of bird activity may ....
It was not a time critical decision and so by the time they got to Gerona everybody was ready. Flight crew, cabin crew, ATC, RFF etc ....
A lot can be set also about rushing into an approach. Cool down first and then ....