Grimoire is not always a true indicator of Skill. I direct you about 6 weeks back to the bungie weekly update where they highlighted a player named Jacob for winning an entire match UNBROKEN 1v3 ..... with 2900 grimoire. I've actually played with said Jacob... man is a MONSTER, he just has 2900 grim because all he ever plays is crucible. The man doesn't even play with a mic plugged in.