And John remains blissfully unaware that The Doctor visited Sherlock years ago and gave him the skull. It was a skull he’d discovered in a ruined church, a thousand years in the future. He couldn’t re-bury it in the grave it came from, because that was completely destroyed, so he took it and gave it to a young Sherlock.
‘This will keep you company until you meet him,’ the Doctor said with a smile.
Sherlock took the skull and immediately began examining it. ‘Who is it? Or rather, who was it?’
‘It’s all that’s left of an old man who lived a good life and became the most important person in yours’.
The Doctor never gave him the name he so desperately wanted, but as soon as he met John Watson on that fateful day in St. Bart’s, Sherlock knew.