Since the day he joined the Chicago Bears a little more than two years ago, Jaylon Johnson has emphasized the biggest prerequisite for top-tier cornerbacks. “Have a short memory,” he said again Tuesday. So perhaps it was apropos that when Johnson was asked about making notable individual growth during a 2021 season full of failure by the Bears defense, he couldn’t remember the pronounced struggles. “What made our pass defense not very good?” Johnson asked with genuine curiosity.