I think there is no scope for churches to have opinions on this matter, as if opinions can be a substitute for facts. I personally like the opinion , but I don't think the facts as of today support the assertion.
I am just not a fan of ecclesiastical histories, I think history must stand on its own feet.
Part of the problem is that some historians both Catholic and Orthodox have been uncomfortable with the thought that we in Malankara were Nestorian "heretics" before the Synod of Diapmer. Also since claims and counter claims have continued amongst the various Christian jurisdictions in Kerala, a polemical and apologetical mindset has pervaded most writers.
So some claim that we were always under Orthodox Antioch and some claim that were always under the Eastern Catholic Chaldean, when the evidence as of now suggests a much more complex picture.
Yesterday I read on a website that the Patriarch of Antioch dispatched Mar Sapor and Mar Peroz to India , what is this statement based on? (little more than the writers imagination I think)
The Orthodox in both the parties have argued that there was some connection to the Tikrit Orthodox Catholicate (later reduced to a Mafrianate) in the East, other historians both Catholic and secular have not given it much importance. I think Met Ivanios of Bethany wrote a post-graduate thesis on the matter (but as far as I know it was not particularly persuasive either). After Fr V C Samuel who bluntly said that we were connected to the Nestorian Church before the Portuguese arrived, a much more
AFAIK there is no proof regarding the same as of today. The part of the East Syrian Church which adopted Nestorianism had spread wide in the Persian empire and in parts of Central Asia, since it was closest to the Indian mainland, it was natural that we developed connections with them. Also the Orthodox church in the East really came into its own when Roman prisoners were carried over the Persian-Roman boundary after Persian raids into Roman territory. So the Orthodox Catholicate remained strong in the areas close to the Persian-Roman frontier and in Northern Iraq.
That the Metropolitan of Rewardashir in Iran exercised jurisdiction in India, which the Nestorian Catholicos transferred to himself is well documented. At the least from 900 to 1600, no such evidence of a lasting Orthodox link has come to light. Could be possible that a Orthodox bishop or even a few came and were received once in a while ; but a lasting connection is not documented.
I think the fortune of the Christians in India was always linked to those of our fellow Christians across the Arabian Sea, we were quite Orthodox when Panteneus came , later as the Nestorians became ascendant they came to our aid, later when they could not and the Antiochians could we got connected to them.
People often are surprised and often offended to see how the Malabar Christians shifted across confessional lines, but the underestimate the struggles of a small church in this huge subcontinent surrounded by non-Christians. The burning theological issues tormenting people in Selucia and Antioch and Constantinople would not have carried the same weight for the people in India.
Till the 1960, all the liturgies were in Syriac which the laypeople did not know, very few clergymen were proficient in Syriac to a high degree (which would be important to comprehend the Christological issues), the Syriac Bishops came consecrated Churches, ordained priests and looked after the flock ( and I don't think they survived long in the tropical weather) , there were long absences between the arrival of Bishops. All this meant that the Church was concerned first and foremost to maintain its Christian character. As long as the Apostolic succession, the Eucharist and rites were maintained as it is , the Church was satisfied.
Hence when the Latins started imposing their customs, trouble broke out. The differences between an East Syrian and a West Syrian were still small compared to the differences between a Syrian and a Latin.
This seems to be a fair assessmenthttp://www.srite.de/
so does this for the most parthttp://www.mgutheses.in/page/?q=T%200998&search=East+Syrian+Missions+India&page=1&rad=all#1