That may be it. However, it's not completely clear. >Steve Jobs has shown us what's possible. That helps would-be successors both directly, as Roger Bannister

That may be it. However, it's not completely clear. >Steve Jobs has shown us what's possible. That helps would-be successors both directly, as Roger Bannister did, by showing how much better you can do than people did before, and indirectly, as Augustus did, by lodging the idea in users' minds that a single person could unroll the future for them. We've got Banister, who lead, and Augustus who followed (I mean in succession - he was still a leader), and ... well, it's a little confused but I guess you're right.