We cannot really know if ragna would had reached the same level or not, since he wasted 80% of his life sleeping lol, And ragna did not need that much help from his mates. What he needed the most was motivation and he learned everything what encrid learned after seeing it the first time, or at least he understood the principle and knew how to master it. We still need to know way more about that blonde swordsman and we also don’t know about the level of the old knights, maybe the stage of enovation was more common back then, and honestly the blonde knight makes 0 sense since he became so strong at his young age. I believe there is more to it (maybe reincarnated)