The thing with WWII leaders is that there are huge differences between leading at Army Group level and leading at Corps level and what is actually required from a successful commander. For example Manstein is one of those blokes who really wasn't anything special as a corps commander, but as an Army Group commander he was propably the best the Germans had. There are also generals who were excellent at division and corps level command, but once in charge of armies and army groups they were quite mediocre.