The Rams just don't play a lot of 2 ILB schemes. Most of the time they play a nickel of some kind with only 1 ILB.
Jones is replacing Young, and Reeder is there on down and distance specific matters.
I still think that if upgrading somewhere no the D is an issue, it's at the Safety opposite Fuller. Rapp has had his coverage issues and if the Rams had very much confidence in Burgess he'd be playing right now.
In fact, they may be thinking about Rapp being another ILB if they pick up a good starting coverage Safety.