Chiefs have Hill and Kelce and then maybe Hardman and then a bunch of other guys like Jerrick McKinnon
Bills have Diggs, Sanders, Beasley, Davis, Knox and then some other guys like Singletary - bills have 5 legit weapons you cant really leave singled up in man coverage - the chiefs have 2 maybe 3 (not sure hardman really beats man coverage consistently but he's great after the catch)
and yes kelce and hill are ridiculous - but diggs is also amazing - when the bills go empty you cannot cover all of them