(Eds: With AP Photos.) By JANIE McCAULEY AP Sports Writer Vance McDonald has been fortunate to spend his rookie summer as the understudy to veteran San Francisco tight end Vernon Davis, who has been eager to take McDonald on as a little brother and teammate, to guide him through the rigors of training camp and the regular season.
McDonald is doing plenty of prep on his own, too. He regularly falls asleep with the 49ers' offensive playbook right within reach - a book he knew would be thick yet has surprised him with just how expansive it is.
''Let's just say I heard them say how big it was and I said, `Ah, it can't be that bad,''' McDonald said, smiling. ''And I just stared at it the first time and I was just like, `Wow.' It's extremely extensive, but that's kind of what it takes to be successful, so that's what I've got to do to get it done.''
The 49ers traded up with Green Bay to draft McDonald out of Rice with the 55th overall selection in the second round of April's draft, and...