The 49ers threw a big, roundhouse curveball at every draft expert.With NFL analysts seeing the Niners' need at wide receiver entering last week's draft, it was widely anticipated that San Francisco would take a wide receiver with its first or second pick in the draft.Yet the 49ers took a safety with their first pick, a running back with the second , a center with the third, a linebacker with the fourth and an offensive lineman with the fifth.Finally, with their sixth pick, the Niners took South Carolina wideout Bruce Ellington.Yet with the draft now behind them, the 49ers – without spending a top pick on a wide receiver – now have perhaps the deepest and most talented wide receiver corps they've had in the Jim Harbaugh era.By trading for Buffalo Bills veteran Stevie Johnson on Day 2 of the draft, the Niners now have starters Michael Crabtree and Anquan Boldin, veterans Johnson and Brandon Lloyd (signed as a free agent recently), second-year pro Quinton Patton and Ellington.Johnson comes to the 49ers with a very productive history. The 6-2, 207-pounder from Kentucky played six season with the Bills and had more than 1,000 receiving yards in three of the past four. Last...