It seemed like Felix had grown a lot in strength, but the one who grew was Kayden, as he was still able to match an entire realm of strength while being at the same level. This meant that all his time learning different techniques and concepts wasn't wasted. And he hadn't even gotten close to the concept saturation point he was predicting.
Most likely, at that point, he could, with luck, face someone in the fourth starting realm and have a slim chance of victory. While those in the third realm would be completely decimated by it to a bizarre degree. Perhaps even another person with six lightning bolts wouldn't be his opponent, simply because he was maximizing his realm to the maximum.
Hardly anyone would go to the point of spending years just to gain a few minimum percentages of strength. Kayden didn't even know one person who theorized this path or followed it. In a way, he was the first and only human to have this disposition.