The race to the financial world’s most prized throne -- Jamie Dimon’s perch atop JPMorgan Chase & Co. -- is drawing closer to its long-awaited conclusion. When the largest U.S. bank last shook up its leadership two years ago, about a half-dozen names appeared on lists of Dimon’s potential heirs. But another overhaul announced Tuesday pushed two women toward the front of the field: Marianne Lake and Jennifer Piepszak. The bank named them co-heads of its massive consumer and community banking business, a spot that was held by one of Dimon’s two lieutenants, co-President Gordon Smith, who’s retiring at the end of the year. The remaining co-president, Daniel Pinto, is widely seen as the obvious replacement for Dimon in an emergency, but as a less likely candidate in a slow and orderly handoff to the next generation.