Eloquence in terms of mastery over the English language. Steve definitely was persuasive, but not because of expansive vocabulary, carefully crafted sentences or even logical arguments. His passion conveyed much more meaningful messages, and actually, it's likely that his simple and direct manner of speech helped those messages come through with clarity.
How can you tell that he didn't carefully craft simple and direct speech to convey his passion with clarity? It's tricky to pin down cause and effect, but since so many people understood his passion through his use of English, I'd be wary of saying he didn't have it mastered.
