I chose other because the answer is ALL OF THE ABOVE... I love that episode. I so do.
ETA: Thematically, season 4 is about changing identities. How do we change when our circumstances change, and what is fundamental about us that doesn't change? Cave!Buffy? Still Buffy! Look at her rushing into the fire to rescue her friends. And it's not just "Still the Slayer" because by the end of that season we know what pure Slayer looks like. We get a chance to see Buffy as pure undiluted Cave!Buffy and see who she is at heart.
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ETA: Thematically, season 4 is about changing identities. How do we change when our circumstances change, and what is fundamental about us that doesn't change? Cave!Buffy? Still Buffy! Look at her rushing into the fire to rescue her friends. And it's not just "Still the Slayer" because by the end of that season we know what pure Slayer looks like. We get a chance to see Buffy as pure undiluted Cave!Buffy and see who she is at heart.