On Shevuos 23b (bottom), Resh Lokish says that Kollel does not apply to Issue Haba MeAtzmo.
On 24b, the Gemoro says that there is a Hava Amina that Kollel does not apply to Issue Haba MeAtzmo, therefore...
Does the Gemoro just mean to exclude the opinion of Resh Lokish? (If so, why not say so)
Reish Lakish does not express this opinion explicitly; rather, the Gemara uses this Sevara to explain Reish Lakish's view. Therefore, the Gemara mentions the Sevara rather than saying "l'Afukei m'Reish Lakish."