Yes, I’ve come across Orthodox who deny St Gregory ever bore the stigmata as well. They see it as a Western thing.
It certainly isn’t something that is popular in the Eastern Churches and it is never depicted in iconography (even Christ is never depicted with the marks of the nails, as far as I know).
As for the vagueness - it is more definite than references to the stigmata of Catholic saints that I’ve read.
Whether or not this relates to stigmata, I don’t know. But there is an Eastern tradition that relates to the wearing around the neck of the Lord’s Cross.
If someone should ask one about it, we are to say, “I bear on my body the Marks of the Lord Jesus” quoting St Paul.
Also, Orthodox and EC monastics of the Great Schema wear representations of the Crucifixion on their monastic robes with the same verse sewn in at the edges.
It probably relates to the “marks” of the Cross.
I’ve no doubt personally that St Gregory bore the stigmata.
As for not finding other references online - the internet is great, but is hardly the penultimate reference, as you know.
Once, on an Eastern Christian forum, I asserted that the Rosary was popular in the East and was practiced by Orthodox saints (St Seraphim of Sarov himself said that our Lady told him in a vision that the Rosary/Rule of the Theotokos of 150 Hail Mary’s was the most important devotion a Christian could practice in her honour to secure her protection in life and death).
But because there were no English language references available online for this, and because the only other articles on this were ones written by myself, my conclusion was dismissed as inadmissable and even “tendentious” on my part, as if I had an interest in imposing western devotions on Eastern Christians (believe me, nothing is further from the truth).
And in addition to books and articles on subjects, it is also good to speak directly with theologians, bishops and priests who are acquainted with the subjects we are seeking information about. It is often the case that they are living repositories of knowledge that they have brought with them from far-away libraries and traditions which only they may impart truthfully and exactly to us.
Also, when I once asserted that Pope Innocent III himself wrote a treatise urging all Christians to cross themselves with three fingers (as the Orthodox and EC’s do to this day), I was accused of all sorts of nasty things (“Where are your sources? Who told you such a thing?”). But I only had a non-English source for this that wasn’t online. Happily, a fellow came on with an English online translation of that source. No response from the gentlemen who attacked me though . . .
The stigmata, once again, are not prized by the East, nor is there any special cult to persons who bear them ie. that emphasizes them. In the Ukrainian Catholic Church, there have been some stigmatists such as Steven Navrotsky and others.
The Blessed HieroMartyr under the soviets, Bishop Paul Gojdich, OSBM, became a stigmatist while in prison and he is sometimes portrayed with bandaged hands etc.
Also, Rome is very careful about declaring stigmatists nowadays. The great Padre St Pio of Pietrelcina, although he bore the stigmata for half a century, has never been declared a stigmatist officially by the Church. (BTW, I had the great privilege of venerating a glove ensanguined by the blood of the Holy Padre Pio last year).
Alex