T-Rex: One day MYCROFT Holmes, who was way better than Sherlock except he was just a little bit heavier and wow you're not going to make THAT into a thing I hope, was deducing crimes at super speed!
T-Rex: His speciality was omniscience, after all!
T-Rex: And since we live in a deterministic universe, Mycroft quickly deduced he could use his omniscience to predict the future. With his perfect, godlike knowledge of the world and the people in it, he could project out what would happen minutes, hours, even days from now.
T-Rex: He was now deducing on a level his brother never had.
Utahraptor: So he puts people in jail for crimes they haven't yet committed?
T-Rex: You know it!
T-Rex: And since he was omniscient, he could use his precognition to figure out all those "oh no how can we arrest someone for a crime they haven't yet done" debates and settle 'em before they ever began. The world became a crime-free utopia even Batman would envy, THE END.
T-Rex: P.S.: Later on Mycroft became an actual living computer and did that thing where ones and zeroes resolve themselves on a screen to form his face, which normally blows chunks but he made it work.
T-Rex: THE END, EVERYONE WHO LOVES MYCROFT IS CORRECT FOREVER