If it were a purely natural universe, finding such a loophole in the rules would be impossible; even if one existed, it would merely be a characteristic of the world. However, this world is not purely natural; it was created by Brahma.
Since it was created by a certain entity, it must possess fundamental logic and rules. This makes it much easier to search for special characteristics compared to purely natural universes.
Moreover, these characteristics manifest as entirely natural and remain undetectable—unless Brahma re-examines and inspects the entire universe, he would never notice the anomalies in Uchiha Brahman's data.
Chapter 302