As long as Tesla keeps the real data secret it's reasonable for us to speculate. And it's reasonable to infer there's a reason they won't disclose it.

> It is unclear which of the systems was in use in the fatal crashes: Tesla has asked NHTSA not to disclose that information. In the section of the NHTSA data specifying the software version, Tesla’s incidents read — in all capital letters — “redacted, may contain confidential business information.”