This paper contributes to the ongoing discussion on the best approach for analysing the syntax-semantic property of the exclusive focus sensitive particle only. There are two approaches which have been discussed in the literature as a result of only's syntactic and semantic properties. The first approach is the Quantifier Approach. It involves only composing with its focus associate in order to form a single quantifier which can quantifier-raise together. The second approach is the Proposition Approach, and it involves a high exclusive (covert) operator which Agrees with adfocal-only, and licenses exclusive interpretation (following Bassi et al. 2002). Based on data from an under-researched Mabia (Gur) language, Kasem, and using semantic, syntactic and morphological tests, I argue for a Proposition Approach for Kasem's adfocal-only cases. I assume that this can equally account for the adverbial-only cases. Overall, the study offers a cross-linguistic support for the Proposition Approach to adfocal-only (cf. Lee 2005, Quek & Hirsch 2017, Bayer 2018 2020, Hirsch & Wagner 2019, Sun 2021, Bassi et al. 2022, Branan & Erlewine 2023, a.o.).