Congrats to him on playing a great game (albeit vs. a really bad offense). Whether he plays one more NFL season or eight he can say he had a 3-sack game in the NFL. But the point is the Rams put him in a place where he had more chances to succeed. Jourdan R.
describes it well here.
Overall, I think Reeder is a nice backup ILB who can spot start and maybe even have a situational role. They are seeing that that role is up at the LOS, between the tackles, and/or blitzing. It is not sideline-to-sidelines and it is NOT in coverage.