Glad you like it! Theories below the cut:
I think Lucrezia is definitely the Other, but became so due to the combination of her experiments in personality transfer and transfer of consciousness across mechanical/biological divides AND a stable time-travel loop. So in other words, while Lucrezia blew up the castle it might not have been the Lucrezia from that point in time. I’m pretty sure that Lucrezia was planning to transfer her consciousness into Agatha, either/both to undone the damage done that turned her into RoboLucrezia or to put her in a Heterodyne body so she could gain access to the secrets of the Heterodynes.
Bill I think either died or went mad or both in the futile effort to reclaim his wife from her kidnapper (who was in fact, his wife). Barry took Agatha back from the Other’s hideout to keep her safe from her mother, which is why he gave her the locket.
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