As a high-rank martial art, the Federation had released only the first three stages of the Dragon Elephant Prajna Art. In other words, when a cultivator reached its peak and broken through, he or she could only remain as a four-star initial stage martial artist; there was no possibility for him or her to enter the ranks of five-star, whatsoever.
If one wanted to take another step, all he or she could do was pick another art; they didn't have any other options.
Even if one was a genius, it would still be impossible for one to get self-enlightened to the fourth stage by just practicing the first three stages of the art, despite the amount of martial arts foundation one had.