According to Dogasu's backback the close captions in the Japanese version do indeed identify the woman as Musashi's mother.
Then that makes the timeline slightly confusing since we know that she left Musashi to fend for herself at some point to pursue Mew for the Rocket-dan. I had assumed that it was while Musashi was still a child though, because Miyamoto (Musashi's mother) looks young in her radio drama artwork.
gentwoer said:Keep in mind the episode would have been originally written well before the radio drama even though it ended up airing months after. Probably a lack of communication between writers or something.
FullmetalJackie said:I always thought this episode was oddly quiet. Like some scenes seemed too calm for this series since the anime is usually restless and constantly shifting between dramatic scenes but here everything was more settled.