Hmm...
As someone who has both been a varsity fencer and has engaged in numerous boffer fights, I wonder. As a varsity fencer, I was not the best compared to the other fencers, but as a boffer fighter I was a lot better. Different fighting styles and all.
Again the captain of our fencing team, no matter which year I pick, I would lose if I fought with his weapon of choice (usually foil, fencing rules on point scoring). Give me a boffer broadsword and a different set of rules (mass combat, simulated wounding), I probably would have won.
Weapon Finesse? Sure. Dex bonus? Probably equal, I think I'm a little faster than most. BAB? Well, I think we would be the same, maybe give a little. Weapon Focus? For the captain, sure. So I'm thinking the team captain would have +2 BAB advantage over me. Now if the broadsword is -4 for lack of Procifiency, the captain would be at a -2 BAB disadvantage.
That doesn't feel right. It wasn't just the fencing captain. Most of the people on the fencing team weren't the type to pick up a boffer and have a go. Yet most of the fencing team were pretty dang good with their fencing weapon of choice. Me, I had to unlearn certain things, what I did, how I did. I've been using boffer weapons long before fencing. And even if they didn't pick up a boffer weapon, I would think they would have proficiency with it.
The major advantage they had is that they really knew their weapon, which seems like Weapon Focus. Giving it only a +1 seems pretty weak, because that just represents an "edge".
When I think Weapon Focus, I think Bladesmaster, someone who concentrates on a weapon at the exclusion of everything else. I can't take on Mariel Zagunis with a fencing saber, but I bet I could hold my own if we both went broadsword. If an Olympic 2-times Gold Medalist doesn't have Weapon Focus (fencing saber), I'll eat my hat.