Kouwenberg (2007) argues that weak and strong subject pronouns occupy different syntactic position in Papiamentu: weak subject pronouns have the status of agreement clitics, whereas strong subject pronouns have the status of lexical subjects. This difference can be seen in the placement of pronouns relative to mood marker lo: The mood marker follows both lexical subjects and strong subject pronouns, but precedes weak subject pronouns. (See Feature 43 "Position of tense, aspect and mood marker in relation to the verb")
Birmingham (1970: 89f) points in the direction of a similar analysis when he refers to the pronouns that follow lo as unstressed, those that precede it as stressed.
Source: Kouwenberg nd
Source: Goilo 1972: 96