You obviously want me to say Matthews is a 60 point player because he's never gotten more, but the difference between him and Faulk is obvious.
Faulk is 26 and had his best season 3-4 years ago. Matthews is 20 and has increased his scoring every year he's been in the league. So the difference is Matthews is trending upwards, and Faulk has been averaging the same numbers for past 3 years, and if anything there has been decrease since his only 40 point season.
Based on your theory Seabrook is still a 40 point D-Man because he scored 49 points more recently than Faulk has.