I like this post a lot.
I wonder if it dovetails with my main complaint about the Bills especially since Daboll left (but even with him a bit), which is I find the Bills offense is so often behind script on the down and distance. They just need too many clutch plays all the time. It just doesn't seem realistic. Is that a problem with a vertical offense?
Potentially. A lot of why offenses work goes back to why an offense was invented. There are 4 major offensive schemes in the NFL: Ehrhardt-Perkins, horizontal timing (West Coast offense), vertical timing (Air Coryell), and sight adjustment (first seen in the run and shoot). Each was designed to do something specific against a defense.
EP: base offense. Lots of high-low, in-out concepts. Get defenses moving in different directions. Base offense in the 60s and 70s for almost all NFL teams. Concepts and formations still survive but few teams use EP as the base of their playbook. The Pats and Brady were a heavy EP team. Vegas probably has a heavy EP playbook based on McDaniels' experience.
VT: invented to force defenses to either play up on the power run, or stay back for a vertical attack. The power run, or persistent run, forces DBs closer to the LOS, and then fast receivers take advantage. Think 1990s Dallas Cowboys, 2000s Steelers. This is the base of the Bills offense.
Sight Adjustment: Receivers and QBs come to the LOS with a series of pass route options, which become more solid with pre-snap and post-snap reads. This offense was primarily brought to the NFL by the run-and-shoot offense. The 1990s Bills were a sight adjustment passing attack. The 2000s Giants were heavy sight adjustment.
WC: invented to get the ball out of the QBs hands quickly, with a lot of trap blocking on runs (Bill Walsh invented the scheme in Cincinnati because his OL couldn't block the Steelers' front 4). Negates a strong pass rush, doesn't require elite offensive linemen. QB must be a very good decision maker. Receivers can fill roles. 1980-1990 49ers, 1990-2000s Packers, current Chiefs are heavy WC users.
When you use a WC scheme, you gain a lot of advantages on a defense, particularly if you have strong tight ends. The routes break sooner than other schemes, so a QB under duress can move the ball quickly. Linemen aren't asked to hold blocks forever. And the team is on a schedule, with maintaining manageable down and distance as the key. That's different than Dorsey keeping a receiver short.
Allen's closest comparison is Brett Favre. Favre was once a wild horse throwing interceptions like crazy. But the WC scheme always gave him easy options early in his progressions, and once he learned to use them, he became the QB we knew. That's where Allen needs to go.