She's certainly underestimated his intelligence.

This is something I'm going to tackle next - Buffy's expectations about what she thought William would be like.

One tiny quibble. I'm not sure a Victorian gentleman would say I've figured it out.. I'm no expert but that sounded slightly wrong to me.

Well, technically he is still Spike in there, only with all the memories locked away where he can't get at them. I guess I was figuring he might have a bit of a slip here and there in his speech...