There was nothing, as in zero, shady about the process. It was a typical bankruptcy, played out a hundred times over. Everyone including former shareholders had a chance to object directly to the judge / court during the proceedings if they thought something was off - not to point out the obvious. Why would anyone take former BioAmber's contracts on former BioAmber's negotiated terms? LCY / LCT BT / LCY B are all free to negotiate their "own" contracts with their own terms which they obviously have. They can do whatever they like, the own all the assets, "free of encumbrances".
going to replace petroleum based products
That is a pipe dream. Bio based will never, NEVER, be cost effective to produce, and for multiple reasons. It will never replace petroleum based products outright. It will take a small market share but that's realistically it.