Re: "But also, if the operator has a JOA (Joint Operations Agreement) with the working interest owners or leasehold owners, which any respectable operator will, then any liability (other than gross negligence) will flow through to working interest owners or leaseholders."
Agreed. And I'm sure you would agree that in the case where a given party owns 100% of the working interest then all of the liability resides with that party alone.
By extension, if Dragon owns Wooldridge's former production, (is operating under their name and operator number) then the liability is still Dragons.
Another good question, why does Dragon not operate under their own number - any operator in "good standing" can add additional wells without posting a bond with the state. I'm not asserting that it is to make production less clear, that will ultimately get sorted out anyway and once the percentages are known following the bouncing ball on a monthly basis via SONRIS won't be hard.