Conclusion It appears that ESPN doesn’t sufficiently factor in pregame probabilities to their in-game analysis, causing them to overreact to game play and not count on stronger teams coming from behind or weaker teams losing a lead. Also, home teams have a strong tendency to over-perform in the fourth quarter versus what ESPN predicts.
https://www.reddit.com/r/CFB/comments/1048sou/i_analyzed_850000_espn_ingame_win_probabilities/