I think this year they planned on him being the 1st replacement for Diggs/Davis. It just so happens that he has gotten injured often this season.
Kumerow was first up when Davis was injured. Not Crowder, Hodgins, or Shakir. Kumerow actually lead the Bills WRs in snaps week 2 when Davis was out.
So yeah they had big plans for him I believe. He just couldn’t stay healthy.