The stories of many charismatic leaders feature a period in the wilderness. In the case of Jesus, of course, the wilderness is literal, and provides both the archetype and metaphor used to describe the experience in others. Hitler, for example, spent much of the 1920s as an obscure, fringe political figure - indeed, he wrote Mein Kampf in prison; you don’t get much more marginalised than that. Churchill, meanwhile, spent much of the 1930s out of government and swimming against the prevailing political tide in his criticism of the appeasement policy.
(As an aside: it is a truism that charisma itself if morally neutral, and can be turned to positive or malign effect. A corollary of this is that a useful initial-plausibility test for any theory that purports to explain charisma is to see how well it generalises to both Hitler and Jesus.)
So, there are two dimensions to the wilderness phase that I have been trying to tease out which may be significant.