Competition is heating up for the San Francisco 49ers as linebacker Dre Greenlaw's replacement is sought. Kyle Shanahan's comments indicate a shift towards integrating rookies into the defensive lineup. The focus shifts to potential day two linebacker prospects like Carson Swessinger (UCLA), Demetrius Knight (South Carolina), Jeffrey Bosa (Oregon), and Chris Paul Jr. (Old Miss). Swessinger stands out with impressive agility numbers, particularly in lateral movement, but he skipped the 40-yard dash. Knight is the heaviest prospect on tape but has shown inconsistencies in play. Bosa, a former safety, offers versatility but needs to enhance his physicality against blockers. Chris Paul Jr. showcases speed and tackling but lacks the size to take on blocks effectively. The 49ers may consider any of these players early in the draft.