In 473 Glycerius though managed to persuade Ostrogoths by use of diplomacy rather than force, to move into Gaul instead of Italy. But now Emperor Leo I, unwilling to accept Glycerius, whom he saw as a usurper on the western throne, sent forward Julius Nepos with a fleet in order to overthrow him. Nepos landed at Portus Augusti and there, as agreed with Leo, declared himself western emperor. At the key moment when Glycerius needed Gundobad, his powerful Magister Militum, Gundobad left Italy. Gundobad fought and killed his three brothers, Godegisel, Chilperic II and Gundomar, to become his father's sole heir to the Kingdom of Burgundy. With Gundobad gone, and no other obvious support, Glycerius simply surrendered to Julius Nepos without a fight.
WI Gundobad returned with a Burgundian army ousting Julius Nepos restoring Glycerius?
How is this altering History? Any thoughts?