It's nothing but sarcasm from him anymore, to call himself an F rank. It's like Jim Keller invited to join yet another semiconductor company, but then made a mere helper responsible for preparing coffee for the rest of the staff.
Guy stops an undead and a living dragon's attack bare handed and was completely fine. Now he stops a golem's attack: "if it was the previous me, i would have been squashed."
Dude has severe brain damage from using too many reincarnation crystals!
I wish he would remember he was technically evaluated at B-rank when he first joined but turned down the promotion. He was told outright he isn't a F-rank