Pravoslavnik
Let me boil it down for you as simply as I can. If the MP has Grace then it HAD such Grace all along. If it has Grace then it is the Church and you are sinning everyday that you are not under it, no matter the reason. On the other hand, if the MP was set up as a Soviet front organization subservient to the will of the Russian government (Sergianism) and repeatedly involves itself in ecumenists prayer with heretics, then it is NOT the Church and it won't suddenly become the Church... ever. Therefore, it has no Grace, and there is never any excuse to join with it, period.
Now our problem with ROCOR-A and Cyprianism is that it refuses to say the the above is the case. For some reason there seems to be some want of another council to condemn them? And to say what? Don't pray with heretics? Done that already. Don't change the calendar? Done that already. Don't submit the Church to the will of the Government? Done that already. The core problem with Cyprianism is that it is only a half-turn away from the World Orthodox. If their is Grace in the World Orthodox Church (MP, EP, etc.) whether they are sick or not, you turned your back on them and that is a sin. But, if they are engaged in heresy, making them heretics, then they have put themselves outside of the Church where there is no Grace of the Holy Spirit in any of their Holy Mysteries. I don't know how else to say it.
So, let me put the monkey on your back: Is their Grace in the World Orthodox Churches? YES OR NO!
If yes, then what is your justification for being separate from them?