I feel like Cumberbatch is very much the big brother of the group, looking after the other two who are too happy or naïve to take care of themselves. Where as he has Seen things, and Knows.

Being an only child I think BC would gravitate toward being like an elder brother only child type. Someone who takes his duties seriously while the sibling'd TH and BW are all blissfully floating through things.

I've been in a weird down mood all day so I randomly decided to rewatch "Sign of Three." I never get sick of drunk!Sherlock trying to deduce.