It’s accurate to say the gap between LT & RT has narrowed as rushers are now moved around. Nonetheless the LT still typically has the QB’s blind side, so for right handed QBs the best tackle still goes on the left. This injury is sad for the player and the team. It’s entirely possible he was going to be traded. He’s unlikely to have value now other than cap reduction. The Cards are forced to address the tackle position. It’s not out of the question to move Johnson to LT. I rated his performance better than most on the board did. There are analysts who think he’ll be better on the left side. This is a deep tackle pool. They could take one with the Texas pocket or gamble one falls to their round 2 pick. The latter would be prospects like Jordan Morgan, Tyler Guyton or Taliese Fuaga.