No. The matter of an ecclesial body having grace or lacking grace and Byzantine matrimonial theology amongst the schismatics are wholly unrelated matters.
I am sorry, I conflated this with the concept of
sacraments having or lacking grace.
But isn't there also a concept, amongst the schismatics, of being more able to say where grace
is, than to say where it is
not, and a fuzzier notion of sacramental validity?
For the Orthodox, everything seems to hinge on whether one is "in the Church" (i.e., in Orthodoxy) or not, and that sacraments outside of Orthodoxy are
per se invalid (but the again, there's that "where grace is
versus where grace is not" thing), but may be convalidated, after a fashion, once the (in their eyes) schismatic Christian is received into Orthodoxy? I have in mind a Catholic priest (God forbid) becoming Orthodox, something about his being chrismated and (I think) vested, making his priestly orders valid without the orders themselves having to be conferred (either absolutely or conditionally)?