Here's an interesting nugget:
A lot of the offseason discussion around Keon centered on whether he would primarily be an outside or slot WR (paging @GunnerBill). The Bills at least to start off are using him exclusively as an outside WR. He is indeed our starting X.
Although I think they will move him around the formation more as the season goes along, to take advantage of his natural YAC skills by scheming him into free releases.