Forgive me, I'm afraid I don't understand you. Are you saying the Good Thief wasn't saved? Or are you saying that the New Covenant wasn't instituted before the death of Jesus?
"The church does not have the power to bind and loose anything that has not already been bound and loosed by God. The Greek grammar clearly teaches this, and the Catholic viewpoint on this is not valid."
I have never heard this before, and I suspect it's a doctrine that originated with the 16th century Protestant Reformers (or later.) If this is the case, I seriously doubt that 16th century NW Europeans discovered something essential about the Church, based on Greek grammar, that didn't occur to any Greek-speakers for the first 16 centuries of the Church's existence.
Could you explain in more detail what you believe about the Church's ability or inability to bind and loose --- who exercises this authority --- and what are its limitations? And tell me when this interpretation originated?
BTW, I'm not asking this to vex you. I'm interested in why you believe what you do about the Church's authority as vested by Christ in Peter and the Apostles.
The New Covenant was not established before the death of Christ and his resurrection. Until Christ died and rose again, there was not death to be buried into or out of which to be raised.
Both "bound" and "loosed" in Matthew 16:19 and Matthew 18:18 are in the Greek perfect tense. That tense describes and action that has been completed in the past and doesn't need to be repeated. The binding and loosing had already occurred in Heaven, and the Apostles were to abide by the will of God. Not the other way around.