Not exactly. She started out low level, but she can handle more electricity than any other electromaster in the city. Shes not a level five just because of her versatility, it just makes her more marketabke.
I guess so! Its interesting to see, but i do hope this flashback section is over soon. We cant be long, since Kuroko had only been friends with Misaka for about a month at the start of the series after pushing out Mikoto's former roommate.