I love him. There is no way that MARTIN is in Benedict's shadow. There is a difference between the actors and their characters. While you can call John Watson a "shadow of sorts" you cannot place MARTIN there!
Prompt -- both of the pills the cabbie offered were harmless. the poison was in the water he gave his victims to take the pill with (he dry swallowed his own) <---This isn't a prompt! This is a Sherlock headcanon!