My own belief is that a god-talker can initiate someone into any
aspect or sub-cult of his deity, but requires the help of a devotee of
that aspect and sub-cult to do so. Thus god-talkers are much more
likely to belong to those aspects/sub-cults which have "flashier"
magic powers than those connected to everyday life. Note that the
Orlanth Thunderous lists god-talkers as worshipers under its magic
keyword, while those for Allfather and Adventurous do not.
Mark Mohrfield