Was Kakashi being selected Hokage the best thing cuz if I remember correctly he had nothing in his arsenal to stop the meteorite that was coming to Konoha in The Last. He literally was sitting there and Sasuke had to save the day. Tsunade at the very least could have destroyed most of it with her 100 Markings. I would have preferred Kakashi to have been Jonin Commander. He really didn't have the firepower and/or defense mechanisms to protect the village and its citizens like a Kage is suppose to. Tsunade may not have been able to defeat Pain, but she could protected many citizens during Pain's assault.