Just having energy doesn't mean you can also exert that much power...there are tons of characters with infinite energy. While for example, in chinese novels you'll have them creating inner worlds within themselves as early as the first few realms where they usually are around tier 8 to 6 - depending on their prowess. Sincerely, without more context is hard to say more than the fact that the soul is strong. For example. Zhong Yue has the spirit of an entire galaxy as a companion, beyond having a strong soul, it gives no ap.