Jamie Dimon—or King Jamie, as he is known on Wall Street—has once again reshuffled the succession deck at JPMorgan Chase. On Thursday, Dimon, now 70 and into his third decade running the bank, announced that two white men—Doug Petno, 61, and Troy Rohrbaugh, 56—had been named co-presidents, and dropped the bombshell that Marianne Lake, once seen as his possible (perhaps even likely) successor, would relinquish her post as head of consumer banking within the next few weeks. In other words, right away. “Something happened,” Mike Mayo, the esteemed Wells Fargo analyst, told me by phone. “I’m not sure what. But I can’t imagine she’s pleased she’s not one of the top two people, given her record.” He continued, sounding genuinely surprised: “The person I considered the frontrunner is no longer at JPMorgan.”