El escudo del Capi no es solo de Vibranium y Adamantium,lleva alguna cosa mas que es por lo que no se ha conseguido duplicar:
During one of his experiments to fuse vibranium with an experimental iron alloy,[2] MacLain falls asleep and awakens to find the experiment a success. However, this is due to an unknown catalyst entering the process during his slumber, and he is unable to duplicate the result
Tambien de la Wikipedia,pero en Ingles,nada de Adamantium,una aleacion experimental y algo de Vibranium