Ten minutes had already passed since the question-and-answer session began. Despite Lord Rhein's stoic expression throughout, internally he was nodding in approval.
Angel's responses were consistent with his displayed character.
He might not feel a strong affiliation with the Barbarian Cave, but he has a strong sense of belonging to the Illusion Demon Island. In other words, as long as Illusion Demon Island remains part of the Barbarian Cave, Angel is unlikely to cause any trouble.
In their centuries-old relationship, Rhein was very certain that Sanders would never betray the Barbarian Cave. Therefore, Angel wouldn't be a problem either.
Upon confirming this, the missing piece of concern Rhein had felt earlier was now perfectly filled.