حُكْمُ الْإِعْرَابِ وَالْجَامِعُ
Syntactic status and a semantic connector.
External syntactic position asks what larger grammatical slot a clause occupies. The semantic common link asks why its content is associated with another clause. These questions often overlap but are not identical.
A pair of predicates under one subject may share both syntactic status and meaning; two independent sentences may have a semantic link without a common syntactic function. Keeping the categories distinct prepares the later analysis of complete connection, complete disjunction and intermediate cases.