[Claud]

since when are laity able to make pronoucements on that canonicity of the statements of individual Bishops?

Now I have to say that's a rather good point! :)

[FormerLib]

since when are laity able to make pronoucements on that canonicity of the statements of individual Bishops?

Are you referring to what happened when Saint Mark of Ephesus gathered the support of the laity against the other bishops?