Fantasy points per target has very little correlation year over year. For players like Corey Davis, that can create some exciting buy-low opportunities.
Past season performance has a strong relationship with future season valuation in fantasy football. Points scored, seasonal finishes, and per-opportunity scoring are commonly used by fantasy owners to evaluate a player in the next season.
But that doesn't mean that every stat from the past season is going to be consistent from one year to the next. Sometimes the most useful way to use a stat to project a player is to understand how little it correlates with performance in the future.