Drew Brees missed breaking his own single-season completion percentage record in 2019 by 0.1%.
https://www.pro-football-reference.com/leaders/pass_cmp_perc_single_season.htmBrees has 5 of the 6 highest single-season completion percentages in NFL history. He’s got #1, 2, 3, 5, and 6, with Sam Bradford at 4.
Brees has his next best season at #14, at 70.0%. Which means he has 6 NFL seasons at 70% or higher, while no other player in history has more than one.
10 of Brees’ seasons rank in the top 50 all-time in completion percentage. Brady only has one top-50 showing, and his best was 27th. Manning only has three appearances in the top 50, and his best was 31st. Both of their best seasons would be Brees’ 8th-best.
And as you’d expect, Brees is therefore in first place for career completion percentage as well. Manning is 7th, and Brady 16th.
IMHO he is the most accurate passer in NFL history.