After a while, the density of UR-entities will get so high, that the likelyhood of a conflict of same position will happen. Their urge will force them to unite.
If 2 UR-entities unite, they form a new entity with new capabilities. They now can make two steps in one heartbeat to follow their urge for re-unification.
The diversity of universe increases.
By the way, the urge for re-unification is the reason for that what physicists cannot explain and call gravity.