First, Datum feature C is NOT measured from the threaded feature. Datum C is orientation and location verified from Datum's A and B.
The threaded feature you mention is measured from an origin established from Datums, (A Primary, B Secondary, and C Tertiary).
As far as dimensional verification in concerned a Basic dimension is not considered to be toleranced. The basic dimensions in both drawings are only used to locate the tolerance boundaries specified within the perspective Feature Control Frames.
Both drawings are correct...