That had to do with the idea that they (his disciples) will judge together with him the 12 tribes of Israel when he returns (remember, he ONLY came for the lost sheep of Israel). Besides, this is so suboridnatinalist (i.e. the decision is not his to grant!) that it shouldn't even be mentioned because it flies in the face of the whole co-equal, co-eternal triniatrian doctrine the Church invented as an afterthought.
FL's argument is right on the money: Mat 16:19 is in the future tense and Peter gets nothing at that time; Math 18:18 grants keys to all disciples not only Peter; the keys have nothing to do with authority over each other; Mat 20:25-26 couldn't be clearer that no one disicple shall lord over another.
I beg to differ. Say what you will, our Lord gives the power of binding and loosing to the apostles as a whole but the keys he gives to Peter alone! Remember that the mention of giving the keys in Matthew 16 in in conjunction with our Lord changing Simon's name to Peter/Kepha upon whom he will build his church. Only Simon is called Peter, not the rest of the twelve. It is also Peter who is called upon to strengthen his brothers. It is also clear in the gospels that Peter exercised a preeminence over the rest of the apostles.