Grades as jungle and what does, and should, affect them?

I recently played a jungle game where I got a C+ and went 8/7/2. Not the best score line but I had total neutral buff control. I stole one elemental drake and solo'd the other four in the game, two barons, and an elder drake. My point is that I feel like a big part of a jungler's responisbility is neutral buff control. It can decide games more so then dying three times to an already fed rengar, which happened in the game mentioned before. So basically my question is whether or not neutral buff control affects grades and if it doesn't then why not? I can't imagine it would be that hard to attempt to program. The game can already detect who assisted in the neutral buff kill via kill feed. The game also already gives out grades differently for a champ depending on their locked in role, or atleast I have been led to believe that. Anyone able to clarify whether or not neutral buffs affect grading, because I honestly do not feel like it does when it should. Any input or opinions would be awesome to hear.