After Josh Allen, there is no question that the most important player on the offense is Stefon Diggs. He not only is a key to the offense this season but will be for the next few years as he is under contract through the 2027 season.
Stefon Diggs is the only player on this list that the Bills' didn't draft but he has been the clear number one wide receiver and primary target for Josh Allen. He has had over 480 targets, 335 receptions, and 4,100 receiving yards while finding the endzone 29 times during his time with the Bills.
The presence of Stefon Diggs though goes beyond the stat line as defenses have to account for him on every play and typically roll coverage in his direction. When that happens it opens up more of the field for the second and third option that makes throws a little easier for Josh Allen.
The Buffalo Bills offense only works as well as it does because of Josh Allen but also because Allen has a wide receiver like Stefon Diggs.