And argument of assertion has largely been the papal polemic here. And see http://peacebyjesus.witnesstoday.org/Ancients_on_Images.html for more on images.
And the reality that under the proposed alternative model to SS, that of sola ecclesia, who also have divisions, as not only to cults typically work out of this model, but the Orthodox differ with Rome on no less a doctrine than papal infallibility, purgatory the use of images, etc.http://peacebyjesus.witnesstoday.org/DisagrementsSSandSE.html
Here is a Google books link to the same work (Difficulties) which has imbedded links in the table of contents, making the chapters accessible from there by jumps to a page or portion.
Thank you much for the links you have offered. I'll check once more upon them soon. You've(?) assembled much there as resource, again, my thanks.