Early NFL lines often start shaky—like a -3 opener sliding to -4.5 by...

https://research-wiki.win/index.php/Does_Pace_and_Play-Calling_Change_Enough_to_Bet_Totals_Early%3F

Early NFL lines often start shaky—like a -3 opener sliding to -4.5 by kickoff—because books adjust to early bets and info flow. Rushing in means paying too much or missing value