He did not add them evenly.
Instead, he firstly increased one aspect to an extreme.
When it came to increasing his attributes, Garen had always been used to directly increasing them to extremes. Now that he had collected so many Potential Points, he prepared to do the same thing.
Since King Gus' contract had been canceled, he did not have so much attention trained on him anymore. That way, there would not be too many variables and concerns even if he drastically increases his powers.
Inside the White Dragon Clan, Garen lay in his cave, surrounded by many books he borrowed from the other White Dragons, as well as the ones he got from Ann.
He had generally calculated the general situation within the Clan, and once he added that to some of Ann's top-secret information, he obtained the truest of real-world statistics. Statistics about the physical fitness of the dragons.