The conversation among 49ers fans and NFL analysts will continue until May 8, when the Niners make their first-round pick in the draft:Wide receiver or cornerback?Of course, 49ers general manager Trent Baalke may take a completely different route. Because Baalke – just like every other GM – doesn't tip his hand, speculation about his plans is just that. Nobody knows.But the common thinking is that wide receiver and cornerback are the positions of greatest need on a team that doesn't have many glaring weaknesses.Wide receivers are flashy and their contributions easy for all to see. The best cornerbacks, on the other hand, are often doing their best jobs when they go unnoticed during a game. Unless they give up a big play, bat down a pass or make an interception, what they do in pass coverage is barely in the spotlight. So it was interesting this week to see a poll on ESPN.com about which position the 49ers should address with their top pick in the draft. As of Wednesday morning, 76 percent of nearly 4,000 voters said the team should use its top pick on a cornerback.If voting had been held in February, perhaps the vote would have gone the other way. At that time, veteran...