Reeder is signed for depth, for special teams, experience and is not guaranteed a roster spot anyway.
If he gets beat out -- then the younger guys play.
Last year he only played MIKE in base defense allowing Jones to play the Jack (Weak ILB) position ... if they have someone who can play that, then Jones plays MIKE and another guy plays Jack, Rose or rookie or whoever
Also, Rams are in base very little .. maybe 25-25% of the time .. And when they think it's a running team -- they are in 21 personnel or even some 12 ... then Reeder played MIKE and Jones the Jack
If not, then it was Jones the MIKE and Rose the Jack.
Reeder may not even make the team ... it's a good signing and if he gets beat out, so be it.