Except that Peter received it corporately in John (see above) and not singularly. In Matthew 16:19, Jesus says "I will give you...", not "I give you..."
He's referring to the future event where Peter receives the ability to bind and loose along with the rest of the assembled Apostles.
One thing is for certain, the Orthodox Bishops are not going to suddenly accept the same arguments that they have been rightly rejecting for over a millenium.
Well, that verb there in Matt 16 "sou" is very much in the singular. So whether it's "will" give, or "am giving", or even "have given"...the point is that the direct object of the giving in that particular incident was Peter and Peter alone.
That's something special. Somehow the singular gift to Peter and the corporate gift to the Apostles of John and Matt 18:18 must coexist. Maybe we disagree on how exactly, but I don't like this idea of emphasizing one Scripture at the expense of another...no matter who does it.
They're both there...they both must be reckoned with.