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As an aside to your questions, I recall (?) GD and Safe Harbor designations once existed at the same time.
GD and Safe Harbor designations were, as are GD's replacement, MD, a little different in their significance.
My understanding is, Safe Harbor entails additional explicit testing, and the Safe Harbor designation is provided if the testing is passed.
The older GD or current MD designations are based more on actual usage, i.e. a particular version appears to be stable.
