I am trying, I guess unsuccessfully, to make the point that anyone who really falls under invincible ignorance can be saved but that does not mean they will be saved.
Well, see, then that definition is ‘A’ (“possibility”), and not ‘C’ (“have the ability to”), as you claim you mean.
I think that the reason that you get the reactions you do, when you make this assertion, is that it comes across in precisely that way…
I would think that, if I were trying to make that point, I’d express it as “anyone who really falls under invincible ignorance is able to be saved” – full stop. Just my opinion, though.
(Edited to add:
For the sake of another thread, I went back to the original Latin text of
Lumen gentium for the way that “those also can attain to salvation” is phrased there. In LG #16, we see the following:
Qui enim Evangelium Christi Eiusque Ecclesiam sine culpa ignorantes, Deum tamen sincero corde quaerunt, Eiusque voluntatem per conscientiae dictamen agnitam, operibus adimplere, sub gratiae influxu, conantur, aeternam salutem consequi possunt.
Notice that it’s “possunt” – which means “is able to”. So, this speaks to
ability rather than to
probability. Perhaps it’s wise to speak in terms of the former, rather than the latter, when discussing this doctrinal teaching.)