“A classic CEO should have his hands in everything: financials, operations, personne. But if you’re splitting your time between the two companies, it becomes much more about who the people are around you.” The WSJ goes behind the scenes to find out why there are barely enough hours in the day for Jack Dorsey to run both Twitter and Square. (When the stock prices are going up, this makes for a feel-good story. When the stock prices plummet, it’s pretty confounding.)