When the 49ers traded for wide receiver Anquan Boldin in March, they envisioned Boldin as part of a 1-2 punch with fellow wideout Michael Crabtree.The combination of Boldin, who caught 22 passes in the postseason as the Ravens marched to a Super Bowl victory, and Crabtree, who was coming off a season in which he set career highs for catches (85), yards (1,105) and touchdowns (9), would give quarterback Colin Kaepernick a superb pair of deep targets.But when Crabtree suffered an Achilles' tendon tear this spring, those plans went out the window. Since then, the 49ers have struggled to find a complement to Boldin, with a parade of wideouts auditioning for the role but falling short. Now, veteran Mario Manningham will be back in the lineup this Sunday when the 49ers host the Carolina Panthers, and Crabtree has returned to practice and could be activated within a couple of weeks. Suddenly, the Niners are looking much deeper at the position.But what's gone on this season at the wide receiver position certainly shines a light on one thing: Where would the Niners be if general manager Trent Baalke and head coach Jim Harbaugh hadn't engineered a deal to get Boldin from the Ravens for a...