The St. Louis Blues are getting a little more defensive depth back, activating Robert Bortuzzo from injured reserve. To make room on the roster, Tyler Tucker has been loaned back to the Springfield Thunderbirds of the AHL. Bortuzzo, 33, hasn’t played since November 8 and has no points in ten appearances this season. The veteran defenseman is averaging the fewest minutes of his career, so shouldn’t be expected to make a huge contribution. Still, with Marco Scandella and Scott Perunovich sidelined, the team’s organizational depth on defense was rather thin. Tucker is one of just five defensemen in the minor…