Burer-Wallace syntactical argument: dative = 'well known to,' genitive = 'well known among'

Burer and Wallace argue that when episemos is combined with a genitive construction, it means the person is part of the group (inclusive — 'well known among'). When combined with a dative construction, it means the person is outside the group (exclusive — 'well known to'). Romans 16:7 uses the dative construction. They surveyed dozens of examples of episemos usage in ancient Greek and found this rule was consistent. Therefore, they conclude the scholarly consensus is 'almost certainly wrong.'