San Francisco 49ers owner Jed York spoke publicly Wednesday amid reports that there is tension between coach Jim Harbaugh and general manager Trent Baalke.York didn't deny there is occasional tension between the two leaders of his team, but characterized it as normal and not a big-picture issue. "Do [they] butt heads on players from time to time?" York told San Francisco radio station KNBR. "Of course. That's what GMs and coaches do.