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Basically they say "we try to rebuild the company and maybe we manage do to it, but even if we are successful, you might get nothing".
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"...investors should read the company's proposed plan of reorganization." (
https://www.sec.gov/answers/qadded.htm)
Sure, but I was wondering why under any circustance "just erasing" old share would make sense. As opposite as, as I suggested, putting them "last in line", just in case something comes up. Which is usually nothing, fine, but at least in the rare case it does, they get it.
Maybe it's obvious to an expert, but it's not to me.