They say they have Kiser penciled in (ie can be erased...) at ILB next to Littleton. And maybe he takes a big year 2 leap and seized the role. Could happen.
But they could also have that spot handled by multiple people. While Littleton basically never came off the field, Barron, Wilson and Hager combined for 780 snaps last year- or 48 per game. Countess and Christian subbed in at DB often for that spot.
The Rams very well could have Kiser, Matthews (they have hinted he could play inside and outside) and a 3rd ILB TBD handle that role. Does not have to be one player all or nothing. And that is the type of spot where teams are often better off rotating in guys situationally based on their strengths. Kiser is a two-down run defender type. Matthews would likely blitz a decent amount from the middle. Etc.