JManM
You take the concept of chakra too literally. I don't think that past life experience should influence in this way as knowledge is not equal to intelligence and not equal to spiritual power. I think the chakra supply depends on the amount of Yin and Yang chakra that the body can produce (look at any person with large chakra reserves). The Yin chakra increases the intellect, but the intellect does not increase the amount of yin chakra, the amount of yin chakra depends on the will and fortitude.
may he learn lighting wind fire or earth based element transformation, following this he can have an armor of 4 elements, basic lighting armor like raikage from kumo / flash cry from bleach shioin yoruichi, earth armor like kakuzu, and a fire armor like genrysaii from bleach( if u read the manga then you have a general idea or i just gave spoilers xD, wind would be a hurricane around him amplified with clan technique. since he is using the puppets he can do chakra strings, he can follow up something like doflamingo (one piece) and have element strings. this is an absolutely amazing start would love to see it in completion