By Claudia Cristoferi MILAN (Reuters) -Leonardo del Vecchio’s right-hand man on Monday took the reins of the 27 billion euro ($28 billion) holding company left behind by the Italian eyewear billionaire who died last week. Del Vecchio’s departure raised questions over the fate of some of his assets, in particular his stakes in financial firms Mediobanca and Generali, whose management the 87-year-old magnate had criticised. Del Vecchio and fellow tycoon Francesco Gaetano Caltagirone in April lost out in a shareholder vote over leadership at Generali, while Mediobanca CEO Alberto Nagel’s position…