Something to keep in mind: in the Catholic Church there are such things as "secondary relics:" objects of non-miraculous origins that became holy through contact with "truly" holy objects. Thus, a ring can become holy and worth veneration by contact with or by being in proximity of a "primary relic" such as the "true" ring or bone of a saint.
So even common objects can become objects worth veneration through indirect means. This would allow the Pope to allow a cloth to be publicly venerated, even if that cloth was known to be painted by a human, if its history was considered to be sufficiently "holy" (perhaps if it was decided that the human painter was supernaturally inspired). Given the politics of the time, it was probably easy for the Pope to just "go along" and permit the cloth to be displayed as a holy object, as long as it was announced first that it was not the "real" burial cloth of Jesus.
A caution here: I am beginning to use Jabba's approach: "perhaps, it is not impossible, one might imagine that, we cannot rule out, etc." Sorry- I am only suggesting possible explanations of what people were thinking at the time, and not trying to present any hard facts.
So even common objects can become objects worth veneration through indirect means. This would allow the Pope to allow a cloth to be publicly venerated, even if that cloth was known to be painted by a human, if its history was considered to be sufficiently "holy" (perhaps if it was decided that the human painter was supernaturally inspired). Given the politics of the time, it was probably easy for the Pope to just "go along" and permit the cloth to be displayed as a holy object, as long as it was announced first that it was not the "real" burial cloth of Jesus.
A caution here: I am beginning to use Jabba's approach: "perhaps, it is not impossible, one might imagine that, we cannot rule out, etc." Sorry- I am only suggesting possible explanations of what people were thinking at the time, and not trying to present any hard facts.
