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Lincoln had the confidence to bring them into his camp and the nation benefited from their combined experience and insight. In other words, he wasn't worried that these guys knew more than he did or that they would "outshine" him. Instead of surrounding himself with friends and "yes men," he went out and got the best of the best.
As I pointed out in a previous post, Rick Carlisle in DAL is employing a similar strategy by working to add former NBA head coaches (Stotts and Casey) to his staff.
I wonder what kind of coach Abe would have made...