I see that the latest Tyndale Bulletin (65.2) has a summary of Dana Benesh's dissertation:
Dana Benesh. "Thomas Aquinas on Hebrews: The Excellence of Christ."
"Due to the influence of his two great Summae, Thomas Aquinas'
reputation as a 'systematic' theologian far surpasses his reputation as a
biblical exegete. Yet his commentaries merit attention due to Thomas'
ability to explicate Scripture, his contributions to the development of
exegesis, and the fact that his commentaries reflect the same
doctrinal and theological concerns as his better-known works. An
examination of Thomas Aquinas' commentary on Hebrews is worthwhile,
given the growing interest in pre-modern exegesis as well as the
priority that Thomas assigned to the epistle. Organizing the entire
corpus of Scripture according to the purposes of God, Thomas orders the
Old Testament books in regard to God as king or Father and the New
Testament books in regard to Christ and the church. In Thomas' scheme,
Hebrews comes immediately after the four gospels. Among all the
epistles, Hebrews is preeminent, according to Thomas, because it
reveals the power of the grace of Christ as head of the church. The aim
of this dissertation is to understand and appreciate Thomas'
exposition of Hebrews in the context of his theological works and in
the context of medieval exegesis."
Dana is a former colleague of mine at Baylor. I had not heard the news, so congratulations to her!