Blue-chippers? Bears GM Ryan Poles has compiled solid list going into season, and it could grow

NASHVILLE, Tenn. — Battles for roster spots are one of the more dramatic parts of training camp, and there will be a flurry of activity for the Bears on Sunday as they narrow the team from 90 players to 53 by the 5 p.m. deadline, but the top of the roster matters a lot more than the bottom. While there always are players like wide receiver Jahdae Walker, who made the cut last summer and came up big months later with the tying touchdown catch in the final minute against the Packers, the players…