It has, as I vaguely recall. It appeared at the end of S03E21, where Alfredo shows up at Sherlock's doorstep and confronts him with a copy of the New York Ledger.

All three African American characters you mentioned are good guys. Aside from Detective Bell, who is clearly an honourable man all the way, both Alfredo and Shinwell has goodness inside them, even before they met Sherlock. Alfredo was ready to become a sponser before Sherlock and you can detect the goodness in his…

I beg to differ. Shinwell clearly have some kind of dynamic with Sherlock, which makes me laugh whenever I see just the two of them talking. We don't know a lot about him - he accepted Tall Boy's new gun, might go work for his gang again, and he might be Whitlock's unrevealed third partner. If there's more stories…

Have to agree Sherlock being the matchmaker seems a little bit out of character. I mean, he might be doing it because marriage will benefit both Gregson and Paige - Gregson will be with the woman he loves and Paige will no longer have a financial problem. But wouldn't Gregson be a little annoyed when someone pushing…