I don't think that Rikku and Tidus where right for each other at all. Yes they were similar, but to me it looked more like Rikku admired Tidus and not love him like the way Yuna and Tidus loved each other.
I think the reason Tidus and Yuna where both great was because they were both following the paths of their fathers, which created a special bond between them.
I think the reason Tidus and Yuna where both great was because they were both following the paths of their fathers, which created a special bond between them.