and a separate set of rules for a two-team tie. This would fall under the multiple team tiebreaker rule.

The first tiebreaker under the multiple tied teams scenario is

1. Head-to-head (best cumulative win percentage in games among the tied teams). If not, every tied team has played each other, go to step 2.

This is only used if all 3 tied teams have not played all of the other tied teams (which would be the case).  There's no true round-robin between BYU, ISU, and KSU.  In common games between the teams:

BYU is 1-0

KSU is 1-1

ISU is 0-1

BYU would win the tie breaker.  KSU and ISU would then go back to the 2 team tie breaker procedures.  The first tiebreaker under the 2 team procedure is head to head.  KSU wins this.  So the CCG would be BYU (as the 1 seed) versus KSU as the 2 seed.