Eh, I think that bit is overblown. We've seen how good Prometheus is, he/she can just ninja the lockup.
That is true about Prometheus, but it was still a clue that was given. It could be important. In season 3, the height of Saras attacker was used as a reason to make us think it was Roy, and in the end the detail turned out to be important as it was Thea, who has a similar height. The killer having access was to make us think it was Lance and Billy too. It could still be important, if Billy staged his death and is still alive somehow, or if we learn about another character who has access to the police lockup. Chase also has access, but us comic readers suspect him to be someone else of course, unless he is both.
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