Coincidentally, that's exactly what Thrawn's presence in Zahn's Specter of the Past/Vision of the Future duology amounts to. Funny how that particular parallel arose naturally out of fandom and shared-universe storytelling, actually...
(It also amounts to a fair assessment of Napoleon, my other RL comparison point for Thrawn. Did you know he wasn't even short? The British took an endearing nickname and turned it into a such a persistent memetic insult it has a psychological condition named after it.)