Rui's idea was certainly not easy.
But it was viable.
With the knowledge, power, and skill that he possessed at this stage in his Martial Path, he was more than equipped to at least attempt to create a Squire Evolution technique. However, there were some pretty major challenges.
The first was that the Squire Evolution procedure required precision, accuracy, and delicacy more than it required power. A single mistake and he would end up killing the subject in a horrifying outcome.
Another problem was that it required an extraordinary amount of healing potions.
After all, the way that the process worked was by subjecting the subject to circumstances that would cause mass cell death, causing the survival of the fittest. All the most genetically fit and superior cells of the body would survive, and thus, the new cells that it would reproduce would be stronger than the last generation.