The Wise Sovereign expressed his "unwelcome" sentiment toward Sanders through his actions.
Although he was worried that the Wood Spirit might be affected by Sanders' "character," it would be better to let the Wood Spirit meet Sanders rather than have Sanders show up personally at the Underground Aqueduct.
The Wise Sovereign's tendency to avoid conflict with Sanders wasn't due to fear; he simply wanted to avoid any association with the Barbarian Cave.
The Illusion Demon Island is one of the rare main battle factions within the Barbarian Cave, and Sanders is its leader. His opinions and decisions can impact the entire Barbarian Cave.
The Barbarian Cave is a formidable giant, previously uninvolved in Naraku City. If Sanders or the Barbarian Cave starts paying attention to Naraku City due to the Wood Spirit, it's not good news for the Wise Sovereign.
