Chicago Bears safety Kendall Williamson was selected 258th overall, one pick before “Mr. Irrelevant.” He accomplished the dream of being an NFL draft pick, but nothing is guaranteed with that heading into next week’s cuts.“Coming in, it was something I was thinking about,” Williamson told The Athletic on Thursday after practice. “But I've realized quickly that me worrying about what's happening next week is only going to deter me from having the best day today and the best day tomorrow. So I'll continue to take things day by day. Whatever happens, happens, and just continue to learn and grow.”Williamson received praise from special teams coordinator Richard Hightower earlier in the week for his play in punt coverage against the Colts. If Williamson is going to win the No. 4 safety job against veteran A.J. Thomas, that’s going to be a major element. Williamson said that at Stanford, he understood the value of special teams from coordinator Pete Alamar.“In high school, you don't really get it. In college, some guys don't really get it,” he said. “But (Alamar) started preaching to me, one, I'd be able to use my physical tools to be able to make a contribution on special teams in college and two, I saw so many games that I had in college that were completely flipped because of what happened on special teams.”If the Bears stick to four safeties, and don’t claim anyone, that spot will go to Williamson or Thomas, who was with the practice squad last season. Here are a few other roster battles to watch Saturday when the Bears face the Bills.Quarterback — Head coach Matt Eberflus made it a point to say that the competition for the No. 2 quarterback spot was created, and not by the coaches. It’s a credit to Tyson Bagent for making this a battle. GM Ryan Poles, Eberflus and offensive coordinator Luke Getsy have a lot to consider, from Bagent’s inexperience as an undrafted rookie versus P.J. Walker’s seven NFL starts, to whether it’s worth it to carry three quarterbacks, to who they trust most to be a snap away from stepping in for Justin Fields as Week 1 approaches. It’ll be a pressure-packed setting for both quarterbacks, which should only help the evaluation.Defensive end — Terrell Lewis leads the league in forced fumbles (two) this preseason to go along with his three sacks. Trevis Gipson has also harassed quarterbacks. Rasheem Green has been ahead of them on the depth chart, but hasn’t produced. With Yannick Ngakoue and DeMarcus Walker likely to be sidelined, those three — along with Dominique Robinson — figure to get a lot of snaps, but defensive end is definitely a position the Bears could still add to next week from the waiver wire.Linebacker — This may be moot if Dylan Cole, signed in March to be a special-teams stalwart, is going to be healthy for Week 1. But we’ve barely seen him this preseason, and undrafted rookie Micah Baskerville has taken advantage of his opportunities both in coverage and on defense. Recently-signed veteran Mychal Walker could also factor into the decision, and the Bears may want to carry six linebackers depending on Cole and what they do at other special-teams positions.