After the McDonald's incident, Su Xiong knew that Lin Xi was very strong. He believed that Lin Xi's strength was at the level of a novice King of Soldiers. However, novice Kings of Soldiers can vary in strength, and it was clear that Lin Xi belonged to the stronger category, definitely a level above Shi Bao.
Su Xiong had a much deeper understanding of the Celestial Alliance than Lin Xi and others did. There were roughly three Kings of Soldiers in total, and their strength wasn't much weaker than Su Xiong's. It shows that the Celestial Alliance acts recklessly in the South City, with no other top underground powers managing them. Both sides would suffer heavy losses if a war broke out.
This was why Su Xiong asked Shi Bao and others to follow Lin Xi to the Celestial Alliance.
The first reason was to ensure Lin Xi and others leave the Celestial Alliance safely, and the second was to test their overall strength.
