Yeah but you're using 5000 yards as a historical high mark when realistically the only players capable of doing it are post-2000 QBs (save for one year by Marino.) So yes, Brees is this generation's statistical leader in terms of high yardage and high completion percentage, but you have to look at the progressive leaders over the years. True, Brees led the league in passing 7 times versus 4-5 times for guys like Baugh, Luckman, Unitas, Jurgenson, Marino, etc., but that's to be expected because the longer the season, the more likely you are to avoid statistical anomalies, and Brees is the high yardage guy across the league. Impressive? Yes. But leading the league in passing yardage 7 times is the takeaway, not the 5000+ stuff...that just leads to recency bias and negates other eras when half that yardage was enough to be #1. One day, the 5000 yard season will be the norm, just as no one would have ever believed the 3,000 yard season or the 4,000 yard seasons would be become the norm. But it's the exact same progressive increase that's always happening, and then people look back on the older players and downplay what they did during their time without context.
I think the volume stuff for Brees gives him a reasonable argument as the #3 QB of the era behind Brady and Manning, although I would still take Rodgers and as
@venecol pointed out, Mahomes is basically passing him right now. But for his statistical accomplishments, I'd rank him ahead of guys like Roethlisberger and Warner. I think that's a fair amount of credit.
en.wikipedia.org