Old World English speaking people, if Jesus healed many with many witnesses, would it have been said at his trial?

No, their court system was nothing like the court systems of today. There was the accused and the accuser standing before in this case the governor usually it's the king or who the king has set in charge of such matters.

The Pharisees and Sadducees were against Jesus and demanded that Pilate executed him.

And when Pilate gave the people of voice to people chose Barabbas, most likely people whom Jesus heals we're not there, or very few of them.