Yes I also have picked up the Ghosts that were meant to be released with Destiny originally as I felt why not? If they are there and possible to get. So that's an extra 6 Ghosts... 3 on Venus 3 on Earth Before I reached rank 2 in Crucible Kills as a specific class I made a note of my Grimoire (2555) Then after reaching rank 2 I was still at (2555) I then thought that if I reach rank 3 which is 2500 kills, that I would be awarded +10, but I was only awarded +5. This happened on all 3 classes as I made double checked my grimoire progress before reaching rank 2 & 3. I believe the max grimoire accessible is 2875 if the rank 2 actually is added onto our grimoire that is. But yes, like you said because I have acquired the Dead Ghosts from the areas we're not meant to access yet, maybe that's the reason for no + onto my grimoire. I'll have to keep track of a friends Grimoire progress to see if they are awarded the +5 for reaching rank 2, I will report back! :)