What is preventing Shinzo from bringing additional food supplies for Willowshore? While he would decline because it probably falls under the "too much aid" condition he is following, I can't think of a good excuse he could give.
Willowshore usually gets food from nearby towns, so the food exists there in theory. Shinzo has a cart, and could be paid to get a bigger one if that's the issue.
Has anyone else's party made this request, and how did you handle it?