Going back a few seconds in the past, just when the Vruves appeared, Grovan had already told all his companions that they would kill everyone other than Nolui. That said, his group quickly spread and charged at different opponents.
Everyone, naturally, noticed the other experts coming after them. However, little did they notice that Rean and Kentucky had purposely positioned themselves so that the Space-Time Realm enemies would end up selecting them as their targets.
As soon as the Vruve arrived, Nolui put his treasure that blocked Divine Senses away. He knew that the Vruves most likely used some other method to find his location. Not only that, but they also followed him without alarming his group.
With Nolui's treasure out, Rean and Kentucky could tell each of the experts' strengths with Rean's Divine Sense Bending Skill. He soon noticed that the Vruves had one Peak Stage Space-Time Realm expert, two Late-Stage, and two Initial Stage ones.