I don't see much deep hidden meaning in these groupings. I do like that there are some nice name groups and great opportunities for solid players from smaller countries.
**I of course missed all of the first two groupings sidenotes of fun:
In group one: a Brazilian is hitting the first tee shot; Canada is the "defending" champ, and Ben An's parents both are Olympic medalists.
In group two: Padraig Harrington and Matteo Manassero both presented on behalf of golf at the IOC bid to get golf in games and therefore are rewarded with pristine greens the first day.