Well grimoire indicates how much you do in destiny so yeah valid point, but as a lot of people say grimoire is exotics, ghosts and calcified fragments but not how much times you did the raid. Its a tricky thing. Someone with 20+ completions can still have a lower grimoire. Pvp and k/d not the best if you play a lot of rift, busy with a exotic bounty, Sword, chaperone etc.. I like the combat rating on destinytracker better, you can see more skill there.