I think +John Cassian and +Augsutine will be a relatively low priority for the blessed council. If we can get to define our mroe important misunderstandings the rest will fall in place.
I am not very familiar with +John Cassain, but I doubt that he advocated such unorthodox beliefs as Pelagius (allegedly) advocated, i.e. that we don't need baptism.
That truly will be a blessed day, when both lungs breath fully together.