The choice between Value 2 and 3 depends to some extent on the analysis of predicative property items (adjectives) as verbal, and of de (< English there) as aspect marker vs. copula when preceding predicative property items. An analysis of de as aspect marker often seems appropriate. Combined with the many cases where de is not present at all, this means that copula-less predication forms the large majority. Alongside equivocal cases, sometimes de appears to be the copula however, in particular in Weygandt (1798).
Source: van Dyk ca. 1765: 22
Source: Schumann 1783: 66
Source: Schumann 1783: 176
Source: van Dyk ca. 1765: 101
Source: Weygandt 1798: 97
Source: Schumann 1783: 18
Source: Schumann 1783: 122