The CG in the B1G would already be clinched as Indiana and Oregon are two games ahead of #3 Penn State. However there are some convoluted scenarios in the other P4 leagues:
SEC:
Georgia is 9-0 and their conference slate is complete so they are locked in but the other spot . . .
Texas has control of their own destiny at 7-1 but if they lose to aTm then the Longhorns and Aggies would both finish 7-2. Florida, like Georgia, has already completed their conference slate and the Gators are 7-2 so if aTm beats Texas then the Gators would join the two Texas teams in a tie for the second SECCG slot. Additionally, Tennessee is 6-2 so there is a potential 4-way tie for the second spot in the SECCG.
In the ACC Miami and SMU are each 7-1 so they control their own destiny but if either or both of them were to lose and finish 7-2 they could be caught by either GaTech or Virginia or both so there is a potential 4-way tie for the two spots in the ACCCG.
In the B12 Texas Tech is 8-0 so they control their own destiny and may have already clinched depending on tiebreakers. Behind them Houston and ASU are tied at 7-1 with BYU a game behind them at 6-2 so all four of those teams are in the mix.