The second hokage is very underrated with the abilities he had he would defeat most ninjas today even with all of the power ups given out. What we know is that he had a water release comparable to kisame teleportation dont know how good that was but the 4th didnt seem like he thought his surpassed the 2nds he made edo and from the fight with the third it looks like he is somewhat skilled at genjutsu plus be fought against the uchiha all the time so he must have learned some type of adaptation to fighting the sharingan and who knos if he had a summon or not. Throwing away the fact that he was killed by a squad of 20 i cant really see many ninja thag could solo him