Exploring the differences between how Marshon Lattimore played and was used as a rookie to now

Marshon Lattimore hasn’t gotten off to the fastest start this season.
 
He has had some high moments, like shutting down Mike Evans in the opener and making a game-sealing tackle against the Chargers. But the consistency isn’t there yet on a week-to-week basis, let alone each snap, which has been the case since his standout rookie season.
 
So, the question is, what has changed since that season? Is it his play? His usage? There is one thing that stands out, but is it enough to explain why there are variations in his level of play?