What does the fact that Catholics had Icons in devotion to Saints the same time as the canon was formed show?

a href="http://ca.news.yahoo.com/nphotos/Catacomb-archeological-superintendent-Fabrizio-Bisconti-points-out-a-painting-discovered-with-the-earliest-known-icons-of-the-Apostles-Peter-and-Paul/photo/22062010/2/photo/world-catacomb-archeological-superintendent-fabrizio-bisconti-points-painting-discovered-earliest.html"http://ca.news.yahoo.com/nphotos/Catacom…/a