When he tries to upgrade his potential it shows that he would require 500 million upgrade points to upgrade his potential.
'Isss… why the hell upgrading my potential needed me so many update points?' some thought that. Well he did not think that he would need this much upgrade points to upgrade his potential.
So he did not upgrade his potential and decided to upgrade his techniques. His absorption technique has already reached A-grade. So he decided to upgrade his other B-grade techniques. He wasn't sure how much upgrade points he would need so wasting no time he quickly clicked on the plus (+) button.
But you can say that he once again became surprised because once again he needed 500 million upgrade points to upgrade his b-grade techniques to A-grade. Once again this puts him in a tough situation.