During the past two days, Yuko and the others have already taken root in the Varna World, they registered with the Universal Company and purchased a place that they can use as a hideout. They only visited the Mercenary Halls once and have yet to take up missions. Instead, they used most of their collecting information.
There are fewer Transcendent Worlds in the Density-1 World Zones but few doesn't mean one or two. There are still hundreds of them from the countless World Zones.
Conversely speaking, Invasive Worlds are less than them due to the difficulty of upgrading from Mortal to Transcendent World by relying on absorbing or assimilating other worlds.
Nevertheless, no matter the ratio between them, Natural Transcendent Worlds whether they're connected to a higher world or not cannot really ignore the damage they can cause, especially if the Invasive Worlds target the Mortal Worlds connected to them.