Christian Washburn has questioned my claim that the idea of a publicly heretical pope was formally excluded in Pastor Aeternus, by equating Bellarmine’s “fourth proposition” with the extreme Ultramontanist school of Albert Pighius. Washburn argues that Gasser had merely indicated that Bellarmine’s “fourth opinion” would be raised to dogmatic status, rather than the “fourth proposition.” I attempt to address this critique by demonstrating how Bellarmine’s own school of thought within the “fourth opinion” was markedly different from that of Pighius.