When the 49ers decided to let Delanie Walker depart in free agency this past offseason, many Niners fans clamored for the team to draft Stanford tight end Zach Ertz.General manager Trent Baalke and has staff had other ideas, however. They knew about Vance McDonald.In the second round of the NFL draft in April, the 49ers traded up to take McDonald, a tight end from Rice that one scouting analysis called "the most intriguing tight end on the board."At 6-foot-4 and 267 pounds, McDonald was a big target at Rice, but smooth enough to many times work out of the slot, playing the role of wide receiver. His versatility obviously caught the eyes of the 49ers, who had used Walker in much the same way in San Francisco.Over his final two seasons at Rice, McDonald caught 79 passes for seven touchdowns.Now trying to win a job as the backup to starting tight end Vernon Davis, McDonald is off and running.In his first exhibition game against the Denver Broncos last week, McDonald made four catches for 66 yards, and his work in the team's Santa Clara training camp has drawn praise from coaches and teammates, from offensive coordinator Greg Roman to head coach Jim Harbaugh and Davis."Everybody has...