Tough call ...
Bucs knows his MLB, Wil knows pucks, Pete is a beaver-ball capping maching and Ken is the man at hoops. Fishy sounds like a good all-around capper, but I don't know him as well as the others.
If I HAD to pick - I'd go with Wil, simply because he can cap the sport (NHL) with the weakest lines out there (aka most profitable).