Whoa.
Okay, that last post wasn't meant to be quite so predictive...(hence why my husband hates watching TV and movies with me; I write my theories on a napkin and flip it over til the end), but that final episode: *Wow!*
Here's an interview with Cumberbach that gave a nice peek into his experience of the character:
This is all about acting, but it sounds an awful lot like writing, too.