Six teams is the conference minimum for basketball, and eight is the minimum for football (in real life, of course). The WAC will be allowed to move forward with seven teams due to the
NCAA granting them a waiver. I assume the NCAA did the same when C-USA was starting up, or when the Sun Belt was going through a massive overhaul, or when the Big West was getting picked apart in the '90s.
And the SWAC (in I-AA) has two five-team divisions and a championship game at Legion Field. But I'm guessing EA will cater to the more common 12-team rule in place for I-A.