Two sentences giving related qualities of one person can naturally share a topic. A sentence about one individual’s height and another about an unrelated person’s sleep may lack that link unless the discourse supplies a reason to combine them.
Even opposition can act as a common link if the speaker intends a contrast. Hence “disjunction” is not defined simply by antonymy or lexical difference. What matters is whether coordination expresses a meaningful intended relationship.
Clause relationshipRhetorical consequence
Related qualities of one subjectWaṣl may be justified
Separate reports about unrelated mattersFaṣl when no common link exists
Contrasting meanings used comparativelyOpposition itself may establish a link