Let's jump to it.
1. The Leonard Fournette Heisman train never takes off.
Yes, he's a phenomenal player. But the line is thin in the SEC West, and the LSU Tigers are surely looking up at Alabama, and very probably some combination of Auburn, Ole Miss, MSU, or Texas A&M. This team has not proven consistent enough, or dominant enough, to run the table. And given how thin the line is for a running back to even contend for the award, no SEC Championship appearance means no Heisman for Mr. Fournette.
2. The Trevone Boykin Heisman train never takes off.