I DVR all of the games and watch most of them. My reports are from my eyeballs. Take that as you will.
"When it counts" is the start of the game, specifically when all of the other "starters" are still in there, especially the DL. Once the front 4 are gone the LB reps become less valuable in terms of season prep and more about evaluating what a LB can do on their own. Klein and Anzalone are gone at that point. This looks like the coaches have made up their minds at the position. Te'o and Robertson aren't playing with the starters, haven't for the last two games.
I'm quite high on Klein, especially for his entrance price. If people are still sleeping on him I'll happily take him cheap. This has the looks of a 2016 Zach Brown/Jerrel Freeman coming into an open opportunity and putting up low LB1 numbers.