Just a quick look at the last season played for each player, adjusted for minutes played per game.
Average tackles per game has TMM out in front on 21.1 with a tackle efficiency of 89.6%, followed by Metcalf with 18.0 tackles per game & a tackle efficiency of 85.9%, then CHT with an average 15.8 tackles per game & an 84.4% efficiency.
I’d still like to see some try cause & line break cause stats if they were around. However on the data we do have, Metcalf doesn’t stand out as a significantly worse defender than the other 2. I wonder how much is perception rather than reality?