Had the Broncos taken Lacy instead of Montee Ball and picked linebacker Lavonte David instead of Brock Osweiler, they would have stood a much better chance of beating the Seattle Seahawks in the Super Bowl.
Look, this is really simple. Had the Broncos drafted Lavonte David in 2012, they most certainly would not have drafted Danny Trevathan. So, it's not as simple as plugging David into Denver's defense and then suggesting they would have won SB 48.
Never mind that, at the time, nobody knew whether Peyton Manning would return to form, or play long enough to warrant passing on a quarterback.