​San Francisco 49ers’ Mykel Williams and Christian McCaffrey take the field before Niners’ 26-23 win in overtime over Los Angeles Rams in NFL game at SoFi Stadium in Inglewood, Calif., on Thursday, October 2, 2025. (Scott Strazzante/S.F. Chronicle)
Mykel Williams knows how tough life has been for the San Francisco 49ers’ defensive line to start the season. Random bodies have rolled into Wednesday practices. Mid-round rookies have gotten starter-level snaps. Former practice-squaders are playing on critical downs.That led to Williams seemingly letting out a Freudian slip when asked how hard it has been to sit and watch his unit over the 49ers’ first four games.”Yeah, just knowing how bad we are – not bad, but like …””Banged up?” A reporter interjected.”Yeah, how banged up we are. Great (choice of) words,” Williams said with a smirk. “It’s been killing me just watching it. … I’m just ready to get back on the field.”Since Nick Bosa suffered a calf injury ahead of the Week 3 game against the Arizona Cardinals, San Francisco’s starting defensive line has consisted of a third-round rookie (Romello Height), a fourth-round rookie (Gracen Halton), a veteran that the 49ers acquired for a sixth-round pick at last season’s trade deadline (Keion White) and Osa Odighizuwa. Behind them is a cast of warm bodies, the majority of whom were not with the team during training camp. Considering that, the 49ers have actually held up pretty well up front. They failed to sack Broncos quarterback Bo Nix on Sunday, but the defense surrendered just 14 points and 296 yards of total offense.This week, against the defending champion Seattle Seahawks, however, the 49ers’ defense will be in a bit more trouble if it fails to generate pressure. Enter Williams, a 2025 first-round pick who says he feels much more confident than he did as a rookie, when he recorded just 20 tackles and one sack in nine games.”I wasn’t happy with what I did,” Williams said of his rookie season, which got cut short when he tore his ACL on Nov. 2, 2025 against the New York Giants, “because I know the type of player I am. I don’t think I represented myself well on tape.”Williams, who was limited in Wednesday’s practice, hopes to have some new tape after this week. Listed at 6-foot-5, 267 pounds, Williams is primarily known as a run-stuffing, edge-setting defender, not as someone who wreaks havoc on quarterbacks. He totaled 14 sacks in three seasons at Georgia. One of the knocks listed on Williams’ NFL.com scouting report: “Pass rush approach is currently underdeveloped.” Williams noted some of the aspects he wanted to improve on after watching back his rookie season: “It’s a lot of stuff, from get-off to pad level to hand usage to having a rush plan.”Niners defensive coordinator Raheem Morris believes Williams has immense versatility in his defensive scheme. Williams’ body type allows him to line up along the edge or on the interior, depending on the package, he said. “He can play anywhere,” Morri