Going by NFL Next Gen Stats https://nextgenstats.nfl.com/stats/receiving
Stefon Diggs is:
#102 in the amount of cushion he gets
#74 in the amount of separation he gets
#27 in catch percentage
#3 in targets
In other words, CBs don't give him any cushion, he doesn't get much separation, but he catches a lot. Interesting.
Meanwhile, Gabe Davis is:
#84 in the amount of cushion he gets
#92 in the amount of separation he gets
#113 in catch percentage
#47 in targets
In other words, CBs don't give him much cushion, he gets basically zero separation, he sucks at catching. Interesting.
Was this useful? Did it have any purpose at all? Probably not.