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Wes said:

John was reluctant to baptize Jesus because he recognized that Jesus was the person who had no need for repentance.
He recognized that Jesus was a person who had no need for repentance. He testified that he did not know who Jesus was until the sign given at the baptism.

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Those baptized by John needed Christian baptism as well (Acts 19:5).

The text does not say so, but even if it was necessary then, it does not mean that it would always be so. There is no general command for water baptism anywhere in Scripture.

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Christian baptism is a sign of initiation pointing to a relatonship with the Christ who has come
That is not in Scripture. Scripture says that, to be saved, one must believe and witness to one's belief with one's mouth. That witness can be at water baptism, but witness must be a continuing fruit of the Spirit until death or Christ's return.

In view of the fact that water baptism became to great extent the next circumcision, a work vainly put towards justification, the saints may decide to omit this now empty ritual. John's riposte to the Pharisees and Sadducees lost no relevance for other pretenders in the post-apostolic period and beyond.

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In His role as Messiah, "born under the law" (Gal.4:4), Jesus had to submit to all God's requirements for Israel
Water baptism is nowhere entailed under Mosaic Law. Had it been, John would not have turned away, not just Jesus, but teachers of the Law!