Given Paul's words at 1 Cor. 1:12,13,
“Now this I say that every one of you saith I am of Paul; and I of Apollos; and I of Cephas; and I of Christ.
Is Christ divided was Paul crucified for you ? or were ye baptized in the name of Paul?”,
it would seem that the word he used at 1 Cor. 4:16, “mimetes” (from which we draw the word “mimic”) would be better translated “imitator” rather than “follower”, a nuance missed in many translations, as per your quote from the Douay Version. It really says nothing about “acting in the person of Christ” unless you've invented some esoteric meaning for “as I also am”.
I really have to wonder where you come up with your ideas and conclusions since they seem so far removed from even the most basic investigation of the Scriptures.
Oh well, what do you have next?
A person who imitates another is in a very real sense acting in the person of another, rather than in the presence of another. You are making my point.