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Its a fair point, but Bloomquist wasn't very good at those positions. He wasn't awful, but is somewhere around -5 runs at both positions.
Hannahan rated as around a +10 run 2B in the minors using Zone Rating. Translated over to SS, that should mean he'll be a slightly above-average one. We will see though, its really an experiment.
My bet is that Hannahan would be somewhere 0-5 runs above-average at SS, which would really make him the best back-up option.