Goku is enough to speedblitz Medusa and Lelouch rather easily. The Vector plates isn't stopping the Saiyan, especially with Kaioken in which he can casually increase his power and speed with. Josuke's stand can touch and deflect normally intangible energies and incorporeal objects or substances. It can also restore things to their original state. For example, he can heal anyone on my team from any fatal attack back to normal. He has a high degree of matter manipulation, like he can take shattered glass and reform it around an enemy's head to decapitate them. Lancer is simply outmatched by this opponent especially considering Josuke has FTL reactions.