Consider what Sherlock tells us: 1) Mycroft is older; 2) Mycroft has greater powers than Sherlock; 3) Mycroft is even more intellectually powerful and ascetic than Sherlock; 4) Everything concerning Mycroft is static whereas everything about Sherlock is dynamic; Mycroft is ennui and Sherlock is energy.
Is Mycroft a literary device to illuminate Sherlock? What is Watson’s opinion of Mycroft, or does he have one?
Your thoughts . . . .?