Christ having one will vs. two wills and the failure of Sola Scriptura

In a debate held in Clearwater, Florida (October 2000), Catholic apologist Robert Sungenis debated Reformed Baptist James R. White on the issue of Papal Infallibility. During the cross-examination period on Pope Honorius, Sungenis quizzed White on the biblical basis for Jesus having two wills as opposed to one, the latter view White stated was a Christological heresy. It is interesting to see White dance around the issue as it shows that, using the framework of sola scriptura (the formal sufficiency of the Bible), one cannot find any explicit evidence for two wills as opposed to one will:

(Sungenis' cross-ex begins around 1:36:00)