This is interesting. Ever since BYU went independent, they've usually signed a bowl deal in advance of the season. Last year, for example, BYU was contracted with the Poinsettia Bowl in San Diego before the season started.
This year, BYU is a free agent. And the Frisco Bowl just happens to have an at-large slot to fill. And the Frisco Bowl is now owned by ESPN, who is BYU's TV partner for regular season games.
From the bowl's perspective, the at-large slot can either be filled by a bowl-eligible team that wasn't selected for one of the conference's bowl games, or by BYU.
As most P-5 conferences barely fill - or can't fill - all of their existing slots as it is, it would be sheer luck if a 6-6 SEC or B12 team came available. More likely, it'd be a G-5 team.
So if the choice is BYU or some random G-5 school, what choice do you think ESPN and the bowl game will make?