Some personal contributions are wrongly divided to companies

While I searched the stackalytics website, nova project' commits in particular, I found some confusing things:
1. Some individuals have the same email domain, like openstack.org, stackalytics tends to identify some as independent, others as OpenStack Foundation, for instance, "<email address hidden>" and "<email address hidden>".
2. Some contributors are divided into independent, but the companies they are hired are OpenStack foundation members, such as 'Devin Carlen'. Is there any possibility that someone wants to make voluntary contribution to OpenStack , regardless of their companies decisions?
3. Some individuals‘ early commits contribution is divided into some companies they worked for later, such as 'Anthony Young', who joined in Nebula in August 2012 and his earlier commits to nova are divided into Nebula.

I know the stackalytics website's process of company affiliation and also checked the configuration file (default_data.json). This json file only contains 1974 contributors basic information. And I would like to know whether there are other ways or data source to solve individuals' company affiliatio problem.