I think the hardest thing about his job is keeping players who have won absolutely everything and been performing at very high intensity for years to keep being motivated, and I see his 3-4-3 move at least partly in that context, almost like setting the likes of Iniesta, Xavi, Messi, Alves etc a puzzle or challenge.
What he has already done which sets him apart as a coach is to create an iconic team that people will include in their all time greatest teams for the foreseeable future, and that is something that basically none of the other top coaches today have done, and happens really pretty rarely.