Yes, exactly. I found a few domains with "stray" nameservers... for instance, two nameservers for provider A, and another one (or two) for provider B -- where p

Yes, exactly. I found a few domains with "stray" nameservers... for instance, two nameservers for provider A, and another one (or two) for provider B -- where provider B was someone like DigitalOcean, with no associated records.