Spiritual lineage? He was locked up for being different! No one wrote books like The Heavenly Footman, Grace Abounding, The Pilgrims Progress, and The Holy War like he did! He was a unique soul! Calvin would have had him arrested!
No one is a Christian in a vacuum. The author to the Hebrews says this:
Therefore, since we are surrounded by so great a cloud of witnesses, let us also lay aside every weight, and sin which clings so closely, and let us run with endurance the race that is set before us, looking to Jesus, the founder and perfecter of our faith, who for the joy that was set before him endured the cross, despising the shame, and is seated at the right hand of the throne of God.
~ Hebrews 12:1-2
The great cloud of witnesses are our legacy in the faith who went before us as our mentors in the faith. Bunyan had his mentors, his cloud of witnesses, who were his spiritual fathers. Calvin was a spiritual father to Bunyan.