"And this is in response to Mr. Bordynuik's theorizing out loud that he wants to only take in hydrocarbon-only plastics. There was no word on what type of feedstock he actually used for Islechem's testing. "
With this statement you are implying that it is DIFFICULT, but not IMPOSSIBLE, to get hydrocarbon-only feedstock. So, since it IS POSSIBLE to get hydrocarbon-only feedstock, maybe JBII has a supplier willing to provide it.
Is this POSSIBLE? And if it is possible, would the output also be possible, given the hydrocarbon-only feedstock?