Thank you, Cyprian. However, the position I hold, and I believe the GOC holds it, too, is that Met Chrysostom was wrong to waver, but he did so out of understandable uncertainty and good intention, given the circumstances. There were New Calendar bishops who appeared on the brink of repentance, but insistence on their schism might hinder their return. And Met Chrysostom changed his mind on schism after conversation with the Patriarch of Jerusalem, who, along with the other patriarchates that hadn't yet changed the calendar, maintained that the new calendarists couldn't be declared in schism until a Pan-Orthodox synod was convened.
Again, hindsight is 20/20: it is easy to condemn Met Chrysostom now given what we know has transpired. How do we know we would have chosen differently under the same conditions? And even today we are debating the authorities of local synods to make final and binding judgments of anathema; it was a much less settled question back then. When the Greek GOC stood all alone in declaring the new calendarists in schism, while EVERY OTHER jurisdiction, including ROCOR, maintained communion with them, is it a wonder some doubted the wisdom of making such a judgment so soon?
Which brings us to ROCOR and St John. Cyprian quotes St John referring to the "schism" of the new calendar. It might be pertinent to add that St John remained in formal communion with this schismatic church until his death (though I don't know how often, if ever, he concelebrated with new calendarists). After Fr Petros (Astyfides) was consecrated bishop of Astoria, St John and other ROCOR bishops visited him and made clear their support for his mission, but as far as I know they never concelebrated: ROCOR did not establish official communion till 1969 (the new calendarists had already broken communion with ROCOR the previous year over Met Philaret's Sorrowful Epistles).
Once more, hindsight tells us Met Chrysostom's wavering was wrong and Bishop Matthew was right to maintain the original confession. The new calendar was ALREADY condemned by the Pan-Orthodox synods of the 16th century: the 1935 local decision of the GOC only confirmed the existence of the schism that had already occurred. But did Met Chrysostom's language of "potential schism" constitute a heresy? That I submit is not the case, and therefore Bishop Matthew's severance of communion, and subsequent actions like single-handedly consecrating bishops, were not justified.