that's why I said nobody knew this
There are not many lines a week that will move substantially.
Chances for most lines are they move against you as much as they move in your favor. You mostly have no clue. Iowa 2 weeks ago opened -4 and closed -1.5. Nobody in the world could have saw that coming. Clemson +3 and LSU -4 were about the only lines you could guess with pretty good reaosn would move. Most other lines are bets where you're fretting over a .5 point on a 20 point spread that could end up moving 2 points against you come kick (Michigan here perfect example).