Re: IDW Star Trek Ongoing...
Chekov Prime was ill-equipped to be security chief too (he was naive and more interested in scientific trivia than security protocols and he was always geting beaten up) but he did make a competent bridge tactical officer.
Chekov Prime is also a completely different character from the Abramsverse version and was also 25-30 years old when made security chief in the Prime timeline. Uhura would make a far more convincing security chief in the new universe.
"Just give me two seconds, alright, you mad bastard!" - Montgomery Scott, Star Trek Into Darkness