The power to bind and loose was given to all the Apostles, according to Holy Tradition and Scripture (John 20:22-23), starting with Peter, and through them to the Church by the agency of the bishops who were the successors of the Apostles. The keys are the authority to bind and loose sins. They merely metaphorically point to this authority. There is no other authority other than Christ Himself, Who is the only Head of His body, the Church. Neither Scripture, nor the consensus of the Church fathers indicates that bishops who succeeded Peter received any "keys", or that Peter alone had the keys, or that even if he did, that the keys were ever the property of anyone other than Peter, as first among the Apostles.
The Divine nature of the Word of God does not undergo change, because it is, has always been, and always will be perfect beyond all of human comprehension. This we know from Scripture and from what both the Jews and Christians have always believed with regards to God. The Divine nature did not mix itself with the nature of a human being (creature). Only the Divine Person became flesh ("and the Word became Flesh"). The eternal Word of God, being that He is the very Cognitive aspect of God the Father, most certainly did know the exact moment in time that the end will arrive. But answering in the way that is proper for his humanity, he did not tell his disciples what it is not good for men to know. This is why when He was asked about these things before His Ascension, Jesus replied, "It is not for you to know times or seasons that the Father has fixed by His own authority" (Acts 1:7). In this case you'll notice that He did not say "I don't know", rather, He said "It is not for you to know", because He, being the very Logos (Reasoning facility) of the Father, most certainly knows exactly how and when He will bring these things about, in accordance with the will of the Father.
