How does Flora put one plan into action to help two of the Starkadder men--Reuben and Amos--to fill a role that is most suited to them?

Flora talks to Reuben about her idea of Amos preaching to the masses. She explains that this way the person who runs the farm while he is gone should be the natural heir if it is well managed. It takes Reuben a while to realize she is speaking of him, but once it sinks in he thinks it is a good idea and plans to work on Amos himself. Thus, if her plan succeeds, each man will be doing what he most loves.