So they said to him, “Then how were your eyes opened?” 11 He answered, “The man called Jesus made mud and anointed my eyes and said to me, ‘Go to Siloam and wash.’ So I went and washed and received my sight.”
After having been healed by Jesus somehow the blind man seems to know who had healed him but somehow does not make any connection between his healing,Jesus and the Son of Man, but he clearly understood that a man sent from God was able to heal the blind
John 9:31 ESV
We know that God does not listen to sinners, but if anyone is a worshiper of God and does his will, God listens to him. 32 Never since the world began has it been heard that anyone opened the eyes of a man born blind.
Later when he meets Jesus again and he is introduced to the Son of Man again he professes ignorance concerning the Son of Man
Jesus heard that they had cast him out, and having found him he said, “Do you believe in the Son of Man?”[c] 36 He answered, “And who is he, sir, that I may believe in him?” 37 Jesus said to him, “You have seen him, and it is he who is speaking to you.”
Why didn't the blind man make the connection between his healing,Jesus and the Son of Man?