level 1 : can't cultivate
level 2 : very low potential can't reach rank 1
level 3 : low potential have a chance to reach rank 1
level 4 : medium potential have a chance to reach rank 3
level 5 : high potential can reach rank 4 with little bit of luck.
level 6 : Exceptional potential, capable of reaching the pinnacle of rank 5 .
rank 6 and above rely on more than just talent though it helps