He was Julius Caesar's nephew and successor, who ultimately did all of the things that Caesar wanted to do but never had a chance to to see done (the month of August is even named after him). In the lines that Paul mentioned his legacy, I think he means that someone similar to Steve Jobs (his would-be successor in our pop culture) could continue a similar path as Jobs. It's now clear that being a visionary in that position is possible, and he showed us all what just one person can do there.
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.