Look, this is really simple. A whole slue of domain names set up ON the same subject BY the same organization, is NOT multiple sites. It's ONE site.
If the pages link to pages on other domains, it's CLEARLY one site. If they don't link to each other, then it is merely one site with brain-damaged navigation.
There are two possibilities:
(1) The pages on the various domains link to each other, so the ODP can link to one of them, and have all the content represented. We're happy, users are happy, and the sane companies are happy, since they can link to any new pages from their own home page.
(2) Or they don't link to each other, and the only reasonable conclusion is "if the company's OWN WEBMASTER doesn't think his OWN pages ON THE SAME TOPIC are worth linking to, then why on earth would anyone else?"
Either way, the listings shouldn't come back. Resubmittals of them (or additional similarly "related sites") could result in -- well, no need to go into that, you can read the submittal policies. "Related" of course could mean "from the same organization."
If the organization has an ODP link to a home page for information on this topic, it may use that home page to link to any other content it thinks relevant, including pages hosted on any domains it owns. But don't ask the ODP to compensate for ill-considered and counterproductive internal website navigation or promotional schemes.