Walker ready to bust out; Smith returns home

* * * Among the other things Walker said: --The Titans like to blitz, so the 49ers might need to keep extra guys in to block it up. The two-tight end sets can give the 49ers a little advantage. When Walker's in the game, the opposition usually matches that with a nickel back, which should make it easier to run, he said. --Walker's main attribute is his versatility. Last week, he entered for a few plays late in the game when Davis had cramps due to a tight tape job, Davis said. Walker entered the game at that point as a single tight end. --Most of the time Walker is in there, he said he gets covered by a cornerback or a safety. Walker was a wideout in college, and he said not many teams want to leave a linebacker on him one on one. * * * The game Sunday against the Titans marks the return of Alex Smith to Candlestick Park for a regular-season game. The paying audience at Candlestick has always been supportive of Smith, and I'd expect him to get a warm reception. Bu...