Emma taking Henry with her would give Cora the advantage to make Regina think that Emma is going to keep Henry from her, which would make Regina easier to manipulate.
Cora is going to try and drive a wedge between Regina and Henry because she wants Regina to need her and be fully dependent on her. Henry is the obstacle in Cora’s way.
I think Henry may be more mature next season because of his experiences with Cora.
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All magic comes with a price!
Keeper of Felix