The Greater Terran United Confederation may be an old and decrepit power to many people, but it had withstood the test of time.
With the opening of the Red Ocean, the Terrans would never be foolish enough to alienate all of the galactic pioneers that ran wild in the dwarf galaxy.
Unlike back at home, the Terrans did not possess an overwhelming lead this time. The Terrans, Rubarthans and every other power from the old galaxy had to start from the beginning!
This meant that none of them could act as domineeringly as they did back home because they simply didn't have enough strength to back up their demands.
The separation of several hundred-thousand light-years was unsurpassable in ordinary times. The beyonder gates remained the only channel for the old power to extend their reach into the Red Ocean, but only barely.