‘In house: The Bills need to find a slot receiver whom Josh Allen is more willing to target than Isaiah McKenzie. Backup slot man Jamison Crowder, who missed most of last season with a broken ankle, is a free agent. He could be brought back at a low cost as depth insurance. If the Bills want to find an upgrade for No. 2 receiver Gabe Davis, it will take a big investment in resources (either in free-agent money or, more likely, in a prime draft pick). Jake Kumerow, recovering from successful back surgery, also is a free agent.’