When Cuthman came to Steyning, the South Saxons were in conflict with other tribes of Saxons especially the West Saxons
Local Kings would have to submit (sacrifice) to higher authorities. This might be by force, weight of numbers, but not necessarily the truth, justice, idealism, rationality, fair play. This is the Christian way. It may make for harmony, but not for truth or justice. This is real politik. It might have more to do with property rights, honour, pride (hubris), charisma, convenience.