Corsairs don't need lots of allies. Gamma is always full of cruisers, battleships, and yes, of course, gunboats. Do they need allies? Not really. Everyone and their puppy is a Corsair.
Now, yes, the Saber is better than the Titan in my opinion, but frankly, the Tizona guns are awesome. Salamancas rule too.
If the Outcasts were so much better they would sh*tkick the Corsairs daily. And they don't, which says something for balance, right?