Bill Zito, at least as far as he can recall, had not made a game-time trip into the Florida Panthers’ dressing room all season, but he had a headache right before the puck dropped on the Panthers’ game against the Anaheim Ducks on Friday, so he happened to make his way down into the bowels of the Honda Center to grab an Advil while the game was still young. The scene, at least for a few moments, was harrowing. While he was on his way down to the locker room, Aaron Ekblad’s knee buckled and team trainers rushed him back into the locker room. The star defenseman was in agony and the Panthers wer…