The 49ers will head into training camp later this month knowing they won't have standout inside linebacker NaVorro Bowman.Bowman, who suffered a knee injury during the NFC Championship Game in January against the Seahawks, isn't expected to play until midseason at the earliest.So during training camp and the exhibition games, San Francisco's coaching staff will have to decide who can best step into his spot.That question, in fact, tops this week's list of "top 10 position battles" for the team, as projected by Kevin Lynch of the San Francisco Chronicle. While there certainly are other interesting duels – such as Marcus Martin vs. Daniel Kilgore at center, Jimmie Ward vs. Perrish Cox in the secondary and Carlos Hyde vs. Marcus Lattimore at running back (behind Frank Gore) – Lynch points to the competition between veteran Michael Wilhoite and rookie Chris Borland at inside linebacker as the No. 1 battle. - VTA Prepares to Get Fans to Levi's Stadium"The right to replace NaVorro Bowman will be hotly contested," wrote Lynch. "Wilhoite is the faster, more knowledgeable and more athletic player. Borland is more instinctive. Both are diligent students of the game, and their...