Jason,
Having this gift is just that...a gift of the Holy Spirit. It is not that different from the other gifts. They are not up to the person's holiness and having certain charism of the Holy Spirit does not require a person to even be in a state of grace because they are not for the individual, they are for the Church, to build up the body of Christ. Having the fruits of the Holy Spirit speak to the holiness of a person, not the gifts.
Whether or not the person is a fake really should have no baring on our faith. The Church is very cautious with these things because even if the phenomenon is authentic it can put the focus on the person and not what the gift is for and that is to do the work of God. That is the reason why the Church does not have too much to say about these matters.
You are not required to believe but I can tell you there are plenty of those out there with this gift, authentically that have their bishops approval and they suffer much for the sacrifice it costs them to be under such speculation. They even suffer the pains of the crucifixion in their own bodies for the sake of purification, (now you know what Paul really meant). Some are publicized and some are not and yes, some are fakes.