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... they continue to quote the same saints and catechisms.

Indeed, I'm not sure why they repeatedly need to "prove" that St. Thomas, for instance, believed in BoD.  We clearly grant this.  So why do they insist on re-spamming the same quotes over and over again?

So, for instance, I pointed out that there was NO unanimous consensus of the Church Fathers on this issue, as MORE Fathers explicitly rejected BoD than who accepted it.

So Xavier chimes in, "St. Ambrose taught [BoD]".  I disputed that, and my argument was simply ignored.  Nevertheless, OK, even if I were to GRANT that St. Ambrose taught it, we still only have 1.5 Fathers who believed in it, with about 5 or 6 who explicitly rejected it, and the rest are silent.

Please either explain, based on that, how there's a dogmatic consensus of the Fathers in favor of this issue, or have the honesty -- as Rahner did -- to GRANT or CONCEDE that there's no dogmatic consensus of the Fathers on this issue.  Instead we get the LIE repeated that the Church Fathers taught BoD (as a group).

But that honesty of Rahner is not to be found among most proponents of BoD and, as you pointed out, Stubborn, that's typically prima facie evidence that they have already made up their minds for emotional reasons and are not willing to look at the issue objectively.

Indeed, I'm not sure why they repeatedly need to "prove" that St. Thomas, for instance, believed in BoD.  We clearly grant this.  So why do they insist on re-spamming the same quotes over and over again?

They all do the same thing because they know nothing about the subject except that they can't accept that a "nice" non-Catholic will go to hell. (That does not apply to the rare case of the strict BODer who believes that a catechumen can be saved. However, that type never starts a thread on CI to argue about such a harmless belief).

Also, where exactly does it say that Cornelius was justified before his Baptism?

 If you mean by "it" Scripture, a strong Scriptural argument could be made. But that is neither here nor there on a Trad Catholic forum where the Magisterium guides, or rather, governs.