He never would've reached Hashirama or Tobirama's level even if he had lived.
Chakra strength essentially determines your capabilities, his chakra strength/levels are nowhere near Tobi or Hashi's.
People who have better chakra potency and levels and are constantly fighting on a daily basis for their lives... are going to be stronger than those with weaker chakra potency and levels while being in much more ,relatively, peaceful times.