John offered a baptism. A baptism into his life. His life makes a straight way to Christ. He is the Grooms Best Man. He stands next to the Groom and listens.
A life at the pinnacle of sanctity that all souls can receive through baptism into that persons life.
John's baptism helped to open ears so people could have ears to hear the Word.
Luke 7
28For I say unto you, Among those that are born of women there is not a greater prophet than John the Baptist: but he that is least in the kingdom of God is greater than he.
29 And all the people that heard him, and the publicans, justified God, being baptized with the baptism of John.
30 But the Pharisees and lawyers rejected the counsel of God against themselves, being not baptized of him.
So there is something tangible and real that happens when baptized into another person's life.
Of course that is God working.
John's baptism had something to offer because John's life had something to offer.
John's baptism was a baptism unto repentance because he lived a life of purity and penance.
We are baptized into Death and resurrection through Jesus' baptism.
If John's baptism offered those who received it something real and tangible how much more so Jesus' baptism?
It's not just an outward symbol but the primary way God offers to share His life with us. So we can die with Him and in so doing rise with Him.