The difficulty of a realm lord appearing is evident in the void universe. There are several realm trees without realm lords and origin gods above all else knows how difficult it will be to create a 6-law concept. They couldn't create one. So are they to wait for someone to create one and become realm lord when they failed?
The answer to that question is evident. In the void universe, a realm tree with a realm lord appears no more than once among a hundred realm trees. Sometimes, a thousand realm trees are needed to encounter one with a realm lord. That's at best a 1% chance that a realm tree possesses a realm lord or worse, a 0.1% chance. That is not good enough to wait for.