Jefferson is faster and younger and as or more productive with Kirk Cousins. Diggs is a great player now but not post 28 at 20m per with so many glaring holes to fill on the lines.
Vikings don't miss Diggs. They have a younger, bigger, faster more productive player who hasn't reached his prime, and a better tandem overall. The Bills have small dudes, no speed threat, and Gabe Davis.
If we both have Allen clones, I win with Jefferson.
Bills need to find their Jefferson, pocket the asset and maximize the strength of their lines. Josh Allen is the Bills.