John Chrysostom

Then, since they said, "Some John the Baptist, some Elias, some Jeremias, or one of the prophets," and set forth their mistaken opinion, He next added, "But whom say ye that I am?" calling them on by His second inquiry to entertain some higher imagination concerning Him, and indicating that their former judgment falls exceedingly short of His dignity. …

Homily on the Gospel of Matthew 54 ↗

Theophylact of Ohrid

And they said, Some say that Thou art John the Baptist: some, Elijah; and others, Jeremiah, or one of the prophets. Among those who called Him John was Herod, who thought that John after rising from the dead had also received the gift of working miracles. Those who thought He was Elijah did so because of the way in which Christ rebuked and because Elijah was expected to return. Those who thought He was Jeremiah, did so because of His natural wisdom acquired without any instruction. …

Commentary on Matthew ↗

Jerome

But they said: Some say John the Baptist, others Elijah, and others Jeremiah, or one of the prophets. Jesus says to them, I wonder that some interpreters seek the reasons for each individual's errors, and weave a lengthy argument about why some thought that our Lord Jesus Christ was John, others Elijah, others Jeremiah, or one of the prophets. …

Commentary on Matthew ↗

Thomas Aquinas

Consequently the opinion of the crowds is set forth: but they said: some, John the Baptist etc. Different people thought different things about Christ. The Pharisees blasphemed Christ, but the crowds called him a prophet; hence Luke 7:16: a great prophet is risen up among us etc. They said he was John by reason of authority, because John preached penance; above 3:2: do penance, for the kingdom of heaven is at hand. …

Commentary on Matthew ↗

Glossa Ordinaria

So by this instance of the Apostles, the followers of the Bishops are instructed, that whatever opinions they may hear out of doors concerning their Bishops, they should tell them to them.

Catena Aurea by Aquinas ↗