Cam Johnson is not a bad defender and may be an upgrade over Michael Porter Jr., but he poses a sort of quandary with his contrasting skills. For a 6’8” wing player, he’s not a great lateral mover and struggles guarding smaller, shiftier players on the perimeter. This isn’t a huge problem, as he’s capable of guarding up. The problem is that he’s also a below-average rebounder for his position, and would now, essentially, be playing power forward on defense.
The positional switch isn’t a huge deal. Christian Braun is a very solid defender with great size and length for his position.