Now, a little prolegomena here:
Sola Scriptura is not operative during periods of ongoing revelation while
there are actual prophets and apostles giving the actual words of God; Sola
Scriptura is not operative. (Geoff Robinson, The Misuse of Acts 15 by Catholics to
Disprove Sola Scriptura, beginning at the 2:22 mark)
I doubt he will realise the significance of this, especially his
long-standing proof-texting of Matt 15//Mark 7, but it does show that, using the historical-grammatical method of exegesis (yes, even for Matt 15//Mark 7) cannot produce Sola Scriptura.
Further Reading:
Not By Scripture Alone: A Latter-day Saint Refutation of Sola Scriptura
