Sorry, I was imprecise. I understand that it is possible to collect damages from controlling shareholders of corporations; for instance, in any tort case; in several states, unpaid wages also incur liability on company owners, as they did in Vuylsteke. I was asking specifically about your liability insurance argument.
You mean that insurance can count in determining adequate capitalization?
The cases I can find that are most on point is Walkovszky v. Carlton, where a claim of underinsurance was directly at issue (unsuccessful because the insurance that was carried met an explicit statutory requirement) and Autrey v. 22 Texas Services Inc. (on a summary judgement motion finding there are facts in dispute, so not squarely ruled on).
A couple of relevant papers that discuss insurance throughout: