Nice try, but the Waldensians in particular were most definitely not the precursors to bible only Christians.
For starters, the “Perfect” Waldensians had priests and bishops. The bishops, called “majorlis” preached and administered the sacraments of penance and eucharist.
They took vows of chastity and poverty as well; not exactly qualifying as a born again, sola fida, sola scriptura forerunners.
They had a sacramental tradition.
But they were not Rome
Well not exactly. Maybe after pain of inquisition some admitted the above. However, the below is more accurate of the movement as a whole:
Waldensians held and preached a number of truths as they read from the Bible. These included:
The atoning death and justifying righteousness of Christ The Godhead The fall of man The incarnation of the Son A denial of purgatory as the "invention of the Antichrist"[2] Valued voluntary poverty They held that temporal offices and dignities were not meant for preachers of the Gospel; that relics were simply rotten bones which had belonged to one knew not whom; that to go on pilgrimage served no end, save to empty one's purse; that flesh might be eaten any day if one's appetite served one; that holy water was not a whit more efficacious than rain water; and that prayer in a barn was just as effectual as if offered in a church. They were accused, moreover, of having scoffed at the doctrine of transubstantiation, and of having spoken blasphemously of the Roman Catholic Church as the harlot of the apocalypse.[3]
The "La nobla leyczon", written in the Occitan language and dated between 1190 and 1240,[4] gives a sample of the medieval Waldensian belief. It is housed at University of Cambridge.[2 Waldensians