I read on http://www.pravmir.com/article_1076.html#_ftnref7, on pages 221 and 222 of The Acts of the Council of Chalcedon, Vol. 1 Liverpool University press vol.1, it is stated that just after hearing Eutychus' rejection of declaring that Christ is consubstantial with us in His manhood, Dioscorus stated, "We all agree with this." I am sure this is a lie to defame Dioscorus, but do you know anything about its historicity?