Same, I remember the elf saying he could copy the ctrl skills and upgrade them (which makes perfect sense since his skill is literally copy and paste) but I became so confused when the skill panel said he had to kill the girl to get ctrl z. I hope it will get explained in the future and it could be possible he just isn't proficient in his skill yet or he hasn't unlocked some sort of hidden requirement to copy them or something.
Yeah the guy with the elf is killing all the other ctrl users so he can get their skills. Only reason why it's pretty confusing is because in chapter 14 the elf said "The only way to obtain the skill and evolve it without killing the target is... 'ctrl+c' is the only way", which should mean that mc should be able to copy the other ctrl skills too.
What the hell? I thought he can copy the girl power but he can't now? Why? They say crtl c is the only one who can copy every ctrl power without killing them but now he can't even copy the Weakest holder of them all without explanation and to get it by killing the holder now really? I'm confuse now...