I think that the only true witness that knows about the fact that shagun gave her baby to Alak at birth was the mother or Bua of Alak?
I remember the older lady came to the Bhardwaj home and took alak away before her delivery when she found out that Alak has miscarried.
Wonder what happened to her cause she could have easily convinced Alak that her Devs mother was Shagun.
Sorry if this does not make any sense....my excuse... its late!š³š„±