Just looking at WR alone:
Chase
Waddle
Metcalf
Jefferson
McLaurin
Kupp (2017)
And in the up and coming cayegory, you've got guys like Olave and others.
In what has been an era of elite WRs in the draft, the Bills have come away with precisely ZERO in the draft. Gabe is good. But he's not a true #2, not nearly reliable enough.
How much more difficult would our offense be with one of those guys opposite Diggs?