Apparently the possibility that Gabriel also spoke that language was ruled out perhaps simply because Gabriel claimed no ability in the Lisan Arabi Mubina.
Mubina derives from Bina as the Angel of Christ who sits at the right hand of ChochmahKeter with Ahmed (Achamuth) at the left. Mubina speaks for the Churches. Mubina teaches the Mursaleen (Rasul's Bride) who teach the Mu'mineen towards whom the Muslims are supposed to be friendly.
This it seems the Nabis (which still included Maslama bin Habib at this point) presented themselves as interpreters of ecclesiastical poems for Sabi Apostles which Gabriel taught allegedly being not his own compositions but from Christ's Angel through the Spiritual gift of Glossolalia alone by the power of the Father's name.
