Ought

Mycroft tried to think of all the places Sherlock might be and what he might be doing. He might be in America, studying accents. He might be in prison for housebreaking (no sense of boundaries!). He might be floating dead in the Thames after having insulted the intelligence of a gang member. He might have joined MI-6 and would already be in deep cover in Iran. He might be sitting quietly in a flat laughing at his brother rushing around (metaphorically: Mycroft did not rush) to find him. Whatever he was doing, Mycroft ought to be able to find him!