FBS programs would have a greater advantage playing later in the year because of more scholarships and depth. Meaning it wouldn't affect them as much.
..playing early in the year means two school are on a generally level playing field as both teams don't have many injuries. If you're trying to give the FBS teams even more of an advantage besides home field and amount of scholarships, sure play later in the year.
...you give the Bison more scholarships (FBS) and home games against FBS teams, instead of always on the road, and they would have easily held their own over the course of a season the last five years.