First, I kept the original Aurochs intact. My free agents are:

Wakka for one. He's coach and captain of the Besaid Aurochs, brudda!

My other free agent is Vilucha, because she's from Besaid and its the Besaid Aurochs. Duh! Plus her clothes kinda match the team uniform.

Besides the Gullwings, I can't remember who my free agents are in X-2. To be honest, blitzball is not as fun in X-2, and sphere break is the better mini-game in that one. I do remember that I wanted "Star Player" (aka Tidus) but I haven't unlocked the Abes yet.