Honestly, the whole Hybrid thing wasn't really very clear to me and I needed it explained for me on this very forum. Though to be honest, Hell Bent is something of a unfocused mess. The Doctor is back on Gallifrey. Rassilon and the High Council seek him out, so he stages a coup against them and exiles them. The he sort of resurrects Clara, which then leads to violently escaping Gallifrey so the two of them can monologue at each other for a bit. They meet up with Ashildr who also joins in in the monologue delivering, during which the non-significance of the Hybrid as apparently established. After more monologues, the Doctor has his mind wiped of anything to do with Clara,
With the way Doctor Who is written, there is no "changing your mind during the course of the series." Before the season is written, Moffat has the season's story arc mapped out. He would have known before he wrote the first script what the Hybrid would have been.I'm not sure if that was the original intent or they changed their minds during the course of the series.
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