This is my biggest concern with this team and I think it also has to do with why a lot of us were hoping for a WR early in the draft. Personally, I thought the difference between Michael Floyd and our second WR (call it Donald Jones) was a lot greater than the difference between Gilmore and Drayton Florence. However, I'm afraid that philosophical rigidity and an unwavering commitment to the horizontal passing game played a part in the Bills waiting on WR at the draft. Sure, they tried to bring in Meacham, but when that didn't work out, they didn't do much else to get better at WR. My fear is that the coaching staff does not see the need for a big bodied, physical, vertical passing threat in this offense.
I'm really worried that Chan thinks that he can scheme around the talent deficiencies at WR and find quicker route runners to fit his scheme. But, I think that scheme only works to an extent. In the NFL there's too much talent for a single scheme to dominate for a long period of time as all teams will adjust. You have to have good players that can create mismatches.
Right now, I see a very one-dimensional passing game, and I don't see the talent on the roster to adjust.