Why Drew Brees never won MVP

At the time, Marino was the only one to get to that threshold.
In Bree’s’ era, you had Drew, Favre, Brady, Big Ben, and Eli hovering around there.
Actually Jack, Dan Fouts and Warren Moon, IIRC, in 1980/81, and Moon in 1990, both came very, very close to topping 5,000 passing yards in a single-season. Fouts almost did it a couple of times a couple of years before Marino went pro with that potent, powerful, "Air Coryell" Chargers offenses and Moon, I believe came within maybe 150-200 yards of surpassing 5,000 yards. Dan Marino came within 234 yards of breaking 5,000 passing yards in 1986 on what would ultimately be a mediocre 8-8 Dolphins' squad who was retiring a lot of aging, older, once-great "Killer B's" early-to-mid 80's defensive players like Blackwood Brothers, Kim Bokamper, Bob Baumhower, Kim Betters, A.J. Duhe.

I've always held a strong fascination, affinity for Warren Moon because in many respects, he and his accomplishments, passing style, him being underrated despite his aerial achievements and all the Pro-Bowls, playoff appearances, he was very much a proto-Brees type QB plus the two players respectively had very long, drawn-out successful careers.

Warren Moon was very much underrated and over-looked for many of the same reasons Brees' was throughout their careers except in Moon's case, late 70's institutional NFL racial bias idiotically kept him out of the NFL for 5 forking years and he had to prove his worth to NFL scouts by slogging it out in Winnipeg in the CFL, winning 5 Grey Cups before Houston signed him as a FA in 1984.