Their maximum fermentation temperature (performed in bulks—massive piles) is considerably lower than the ideal kiln temperature (~53°C), and is in the ideal range for microbial (and mold) growth. There is little doubt that certain specific microbes can cause tobacco fermentation at these lower temperatures, yielding aromas that may not ever be present in kilned tobacco (or traditional, Caribbean pilon-fermented tobacco) . And the risk of mold is significant.
Bob