Actually, do you think the name Gregson is a subconscious, or indeed conscious, nod to DCI Lestrade? After all his first name is Greg.
By the way I love the bit when Sherlock questions why Lestrade is being called Greg and John tells him 'it's his name'. Sherlock is just so... clueless sometimes.

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Don't make people into heroes John. Heroes don't exist and if they did I wouldn't be one of them.
