What would it take to bring a reanimated Classical Master like Leonardo Davinci up to the qualifications of his modern Phd. peers?

Clearly Leonardo Davinci, the quintessential renaissance man, master of art and engineering, creator of many human masterpieces, wearer of many hats, super genius, was well beyond his time. If restored to his prime, with all his mental faculties, is he already easily the equivalent of a Phd. in all these fields?

Would he be far beyond them?

Would it take many years for him to digest the past half millenia, and add to his skill set?