Could a mortal man do what Jesus did? Yes, if God gave him the authority, which is how Jesus did and taught all He did and taught.
What is arrogant about exposing error? You are committing a logical falacy by appealing to the majority, especially since the Kingdom of God is not a democracy.
As to your comment concerning what Jesus said about Zecheriah, what I find odd is how others and you have simply dismissed the Lord's words when it is convenient to do so instead of trying to understand why He said what He said. For instance Jesus said there is "only one true God". Now why should I believe men and not the Lord?
The only proof I need that there was no prophet in Israel between Zechariah and John the Baptist is the Palestinian canon, which excluded the books and portions of books found in the Septuagint since as I posted God gave the Jews authority over the OT and in view of who wrote the NT He extended that authority to the whole canon.