He's a decent punt returner, but not a great one. He shouldn't be returning kickoffs. That mistake of returning one from deep in the endzone the other day alone should have gotten him benched. He has virtually no value as a receiver. His being a decent punt returner does not make up for his lack of value otherwise.
The Rams need a punt returner who has some other value to the team. Natson doesn't. Put him on IR, and see if any of the kids can fill his tiny shoes. If not, draft or sign a rookie or two to compete. Preferably one who can be a useful backup elsewhere.