By Andy Silvester Jamie Dimon, arguably the single most significant figure in global finance, gave his clearest indication yet that he is thinking about stepping down from JP Morgan. Dimon has previously brushed off questions about the remaining length of his tenure by saying he would stay five more years, every year. However yesterday he told a New York gathering that “we’re on the way, we’re moving people around,” Dimon said. “The timetable is not five years anymore.” He has been at the top of the shopfor 18 years. Some have speculated that Dimon, never shy of an opinion on geopolitics, coul…