Why 49ers will need major contributions from 2025 draft class

General manager John Lynch typically has tried to fill needs on the 49ers' roster in the draft a year before there was a need to fill.The 49ers have done so little in free agency this offseason with an alarming number of net losses that they will need to draft for the here and now.And that reliance on rookies stepping into big-time roles greatly reduces the team's margin for error a month from now in the 2025 NFL Draft.The 49ers' biggest weaknesses to be addressed are along the defensive line.San Francisco released defensive tackles Javon Hargrave and Maliek Collins, and defensive end Leonard Floyd. Those moves took a 49ers weakness and made their depth chart even more thin.Collins and Floyd started 17 games apiece. Hargrave started all 22 games in which he appeared for the 49ers, including three in the postseason.If the 49ers were to line up for a game with the players on their current roster, their starters would be Nick Bosa and Yetur Gross-Matos at defensive end and Jordan Elliott and Kevin Givens at the tackle positions.The 49ers need defensive linemen right now, and this year's draft is about their only opportunity to add significant contributors.Perhaps, the deep and...