hey man, the rules were recently revised.
the tentitive rule is that the higher ranked player will now select the fighter they wish to use from the roster with the underdog/lower-ranked player picking second. This gives the better ranked guy the ability to get his first pick while the lower ranked guy a chance to counter the style of the first with his selection. Players will also be able to choose their own created fighter. That means that even if people are able to max out their fighters at 100 (unlikely, most sports games dont even let you get to the eliete level) you can pick your own 94 ranked guy.
We made this change because it came to light that created fighters will need to finish career mode before playing online. cheers.