Strength of schedule is calculated from the opponents projected fantasy points allowed for the WR position. The best rating is +16 which gives the player the advantage against the defense and indicates an easy opponent, the worst rating is -16 which gives the defense the advantage and indicates a tough opponent.
If you’re going to draft Colston, you’re doing it for the consistency. Over the last four years Colston has registered between 70-84 receptions, 1,023-1,154 receiving yards and 7-10 touchdowns. He’s not much fun to watch, he won’t be on many high-light shows but he will provide you with consistent numbers which is something that gets underrated in fantasy as we all want to find the next great talent. Drat him and forget about, he’ll have his numbers at season’s end.