The only specifics we have of Alma’s teachings to the groups are those presented to Limhi and his followers. It may have been the last or the first presentation, but it was likely the first. The Limhites are the Almaites’ family, perhaps even literal kin. They come from the same place, from the same set of experiences. Therefore the empathy between the two groups would have been the highest and it would have been easiest for Alma to establish his innovations first among the Limhites and then among the rest of the people. Perhaps Mormon gives us this one example rather than all of them because the rest were essentially repetitions. In any case, Alma goes to Limhi and his people and preaches the gospel to them as Abinadi and Yahweh had revealed it to him.