This time I've waited until the triumphal arch was available.
In Dec 8AD all houses have been filled - finally.
You can now finish by sending the requested oil (that's what I did) or you can try to rebuild Caesarea as an "eternal" city (I don't have the time and patience to try that).
I was a very confused by the gatehouse effect of the triumphal arch until I discovered the explanation in Brugle's thread "Triumphal arch walker behavior".