Wednesday: Day 4 of 18.

Highlight: Mario Williams returned to camp, and his status is day to day while he rests his sore foot. … The Bills’ defense continues to throw lots of blitzers at the quarterback. Cornerback Stephon Gilmore looks good.

QB watch: Veteran Kevin Kolb and EJ Manuel were about even throwing the ball. Manuel looked very good running, eluding the rush and escaping the pocket on a couple of occasions. Kolb took 36 snaps, Manuel 28 snaps and Jeff Tuel eight.

Roster Notes: Coach Doug Marrone said he’s not too satisfied with the competition at left guard between Colin Brown and Doug Legursky. … Cornerback Leodis McKelvin played with the starting defense.

Schedule: The team is off today. The Bills practice from 8 to 11:10 a.m. Friday and Saturday and from 2 to 5:10 p.m. Sunday.