Josh Allen unable to cover up three glaring weaknesses in Bills' first loss of season

In this story:
A healthy Josh Allen can cover up a lot of weaknesses. Such has been the case for the Buffalo Bills in recent years.
In Week 5, however, the New England Patriots and head coach Mike Vrabel found ways to exploit the Bills' vulnerabilities, and Allen was unable to overcome multiple self-inflicted wounds.
The end result was Buffalo's first loss of the season — a 23-20 dud on an otherwise beautiful night in Orchard Park.
Here are the three lingering issues that cost the Bills dearly on Sunday Night Football.
Subpar secondary
While head coach Sean McDermott's defensive scheme has been known to cover up any weak spots in the secondary, there are simply too many to hide right now.
Coming off an ACL tear, Stefon Diggs abused cornerback Tre'Davious White for most of his 146 yards and 10 receptions. Although he's a smart player of high character, White doesn't seem to have much tread left on the tires and seems physically incapable of performing at a high level moving forward.
On the opposite side, cornerback Christian Benford, who earned a hefty contract extension this past offseason, has looked average at best through five weeks. Meanwhile, safeties Taylor Rapp and Cole Bishop are nowhere close to the standard set by prime Micah Hyde and Jordan Poyer.
Wide receivers struggle to separate
It's been a perception over the past couple of seasons, and it shows no sign of fading. The Bills' wide receivers struggle to separate from defenders when not specifically being schemed open.
Allen doesn't need much room to fit a ball in, but the Bills' wide receivers struggle to create even the slightest window when facing man-to-man coverage. The Patriots effectively employed such coverage on Sunday with Allen routinely having plenty of time to scan the field, but no open targets to hit.
RELATED: Josh Allen disgusted by Bills' 'piss-poor' performance in upset loss to Patriots
According to Next Gen Stats, both Joshua Palmer (2.2) and Keon Coleman (2.9) average less than 3.0 yards of separation per route through five games.

McDermott's mismanagement
For all the stability he's brought to the organization, McDermott has a tendency to wilt when the lights are brightest and the opposition is led by a formidable head coach.
It's hard to overlook the fact that the Bills' defense has allowed more than 33 points per game in their last five playoff losses starting with the 2020 AFC Championship Game in Kansas City. Meanwhile, it's hard to forget the primetime losses against Vrabel's Tennessee Titans in 2020 and 2021.
The defense was solid against the run on Sunday night, but Patriots' quarterback Drake Maye was able to make multiple key plays off script while averaging 9.1 yards per pass. The Bills allowed Maye and the Patriots to bleed the clock on their final possession and failed to keep them out of field goal range.
RELATED: Tom Brady rightfully rips Bills' head coach for poor clock management
Then, there were 11 penalties accepted against Buffalo. Granted Shawn Hochuli's crew has a reputation for inserting itself into the game flow at every opportnuity, the pre-snap errors, at home, are simply unacceptable. For those of you fluent in McDermott speak, back-to-back weeks of double-digit penalities is not playoff caliber work.

The Patriots seemed to have the answers for Buffalo on both sides of the ball in Week 5, and McDermott and Co. were unable to counter.
— Enjoy free coverage of the Bills from Buffalo Bills on SI —
More Buffalo Bills News:

Ralph, a former college football conference administrator, brings 20+ years of media experience to Buffalo Bills ON SI. Prior to focusing on the Bills, he spent two years covering the New York Jets. Ventre initially joined the ON SI family in 2021, providing NCAA Football Championship Subdivision for NFL Draft Bible on FanNation. Ventre remains as an official voter for the Stats Perform FCS Top 25 and the annual legacy awards. The Fordham University graduate is a member of the Pro Football Writers of America.