I've always thought that those in Limbo of the Patriarchs were under the old law which did not require baptism. As far as if they were in a state of sanctifying grace (justified) I never thought about it. I do not believe they could be in the same state of grace as those that are baptized, because those that are baptized are born again by the blood of Christ. Remember that Limbo of the Patriarchs was not just Jews, it contained 5000 years of peoples of all races and beliefs, from all over the world.
Sounds good to me. Also agrees with Pax re: they died under the old dispensation wherein they were justified without the sacrament. Which brings us back to the question if it is possible under the new law to attain justification before reception of the sacrament of baptism.
Fr. Feeney just said he did not know, Trent says, assuming the translation is correct, that the sacrament of baptism, "which is the sacrament of faith, without which (faith) no man was ever justified". Seems to say that it is faith that is necessary for justification. No?