Do we have any idea what the standard is? I'd imagine that she's only ranked 4 because of range and precision limitations. There's nothing that says low ranked psychics can't kill people.
Also, Touma will probably show up (he does in the manga). He's a side character, but tends to get chapters devoted to him every so often. Chronologically, Railgun starts about a week before Index starts, and will catch up in a few episodes.We'll likely see the bridge scene from Index episode 1, for example.
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