Colton's doing well. But there is a difference without JRM in the game.
Bear with me--I'm comparing Colton and JRM not because they share a position (that would be Colton and Kirkland, not JRM), but because they seem to be sharing the role of "leading tackler."
Colton typically meets the running back and tackles him around 2-3 yards on our side of the scrimmage line. In other words, at about LB depth of the defense.
JRM typically meets the running back at the line of scrimmage. In other words, 2-3 yards sooner. He just has an incredible nose for the ball and great quickness to meet it earlier.
So I guess this is lamentation that we're missing Jalen more than it is a comment on Colton, who I think is doing very well. Just understanding that there is a cost to not having Darrin and, especially, JRM in the game.