They've essentially been using Kincaid as their #1 WR, which worked pretty good against KC.
My guess is that Bills FO sees how good the OLine and Run game are playing, see how well the TEs are playing, on the verge of getting PAlmer back...and likely think it's not worth a 2nd rounder (which they can use on a safety or WR).
If anything, I'd imagine they think it's more worth it to bring an an above average hybrid DL