For the next two days, the 49ers draft picks and their deepest class yet of undrafted free agents have an opportunity to impress at rookie minicamp. Some position groups are being counted on to deliver immediately, but most of the picks are about winning a depth spot while climbing the learning curve to have an impact in 2027. Immediate Need Defensive line After only producing 20 sacks last year, the Niners added five rookies to compete for jobs. Romello Height and Gracen Halton will need to produce on day one, both in designated pass rusher roles. The team lacks an edge speed rusher outside of Height; he has the most pressure of the rookies to have an instant impact. Halton is also being counted upon, but as part of a rotation. Height is one of one. The three UDFAs are talented. DT run stuffer James Thompson Jr. led his draft class with 36 bench reps and has quick feet. Edge Mikhail Kamara builds his game around short-area quickness and had 68 pressures and 10 sacks in 2024.…