an undefeated BYU's path to an NY6 bowl includes rising high enough in the committees rankings to guarantee inclusion. There is about a 99.9% chance a BYU ranked #6 gets in an NY6 bowl. The only way it doesn't guarantee inclusion is if #1-4 is from the SEC and Notre Dame or ACC and Notre Dame, for example.
I think it's completely reasonable to think the AP top 10 released the same week as the Committee rankings are going to have a very similar composition….ie, the AP is a decent proxy for what we'll see from the committee. So looking at games between currently ranked teams (added a couple fringe teams to show examples of teams that could come from behind):
Week 4:
Auburn at Kansas St.
Clemson at Florida St.
expected rise: 1 spot
Week 5:
UCLA at ASU
Mizzou at South Carolina
North Carolina at Clemson
expected rise: 2 spots
Week 6:
LSU at Auburn
Alabama at Ole Miss
Oklahoma at TCU
Stanford at Notre Dame
Nebraska at Michigan St.
Arizona St. at USC
expected rise: 3 spots
Week 7:
Oregon at UCLA
Ole Miss at Texas A&M
Georgia at Missouri
expected rise: 2 spots
Week 8:
Notre Dame at Florida St.
A&M at Bama
Kansas St. at Oklahoma
Stanford at ASU
expected rise: 2 spots
Week 9:
South Carolina at Auburn
Ole Miss at LSU
expected rise: 1 spot
Week 10:
Stanford at Oregon
Auburn at Ole Miss
Okie St. at Kansas St.
by this time, rankings will obviously be significantly different than they are now, so we're really guessing at this point whether BYU will rise, but you get the idea
Week 11:
Bama at LSU
Baylor at Oklahoma
A&M at Auburn
Ohio St. at Michigan St.
Week 12:
Auburn at Georgia
Missouri at A&M
Nebraska at Wisconsin
Week 13:
Okie St. at Baylor
USC at UCLA
Week 14:
Stanford at UCLA
LSU @ A&M
Auburn @ Bama
Notre Dame @ USC
South Carolina @ Clemson
All of this completely ignores upsets. But you can see, there are plenty of forced losses right there to allow for the possibility of teams coming from behind BYU.
Just win baby, there's a clear path to #7…..