Niners outside linebacker Aldon Smith had two sacks last year and tight end Vernon Davis had two touchdowns. Despite those puny totals, it’s easy to understand why general manager Trent Baalke said Tuesday night he’d like to retain both players, each of whom are entering the final year of their contract. Smith, 25, finished last year without a sack in his final five games, the longest drought of his career, and began the season by serving a nine-game suspension for violating the NFL’s personal-conduct policy and substance-abuse policy. As a result of his numerous off-the-field issues, Smith restructured his contract in the offseason so that his $9.