Not all mankind recognizes Him as the Savior.
If his face is that of all mankind, what does he look like?
He had a face when he walked the earth. A face, a human body, was needed then. It is not needed now.
He now wears the face each human soul needs to see-IF they need to see a certain face to accept Him.
Perhaps that is why there is no physical description of Him written by those who knew him. Isn't that amazing? The most important human to ever live was not described by those who knew who He was!
Perhaps, in talking with each other after his Ascension, they realized they had all seen Him differently ?
If I saw a face like Jim Caviezel and you saw what you expected the Messiah to look like would we be aware that we were not seeing the same image? And-if what you saw contradicted what I saw, how could we agree on how to describe Him?
We could not. Perhaps those who walked with Him could not, so they gave no description.
And the ambiguity continues thousands of years later. We will never know the One Face unless the Shroud is real. And even then- that face may not have been the only one He projected.