You may believe what you want, but it isn't necessarily "True Orthodox." But if you want to make a stake in affirming the "heresy" of the MP, then you should work toward calling it to answer charges of heresy at some sort of Synod which could answer your concerns or simply work within the local churches to have the point of the issues you feel to be heresy be addressed so that the faithful are not being "misled." That's the Orthodox thing to do, not attempt to "refound the Church" elsewhere. Orthodoxy doesn't need a Reformation to purify it with warring synods of would be latter day popes. Vagante synods and "clergy" are canonically condemned as graceless and those who follow them, by your would be strict interpretation of the Canons, are excommunicate. So I would be careful about the standard with which you measure and presuming to call it "true" or "authentic" Orthodox.
Patriarch Sergius was part of the patriarchal administration and appointed to his position with its consent after the death of St. Tikhon and he continued St. Tikhon's policy of gaining legal status for the MP, the canonical RUSSIAN ORTHODOX CHURCH.
Jason Bently