Dude, just fucking write 5 fucking pages on how awesome George Plimpton was. That gives you about a half dozen tangents you could go off on, too.
Seriously, this is what you need to do, fill the paper with utter bullshit and examples of famous sportscasters, where they are today, how much they make, what their day-to-day life is, their other job options (commercials, etc), and so forth.
Use the same outline you would have originally, but to support your topics, include examples of the several sportscasters that you picked. God, that would take up so much room!