I like Jungle Gragas, and I like this guide for the most part, but I would like a couple of clarifications:

[*] Why make Body Slam a priority over Drunken Rage? By the point you start leveling it, Gragas can already take camps super fast through Q alone, so the only reason I'd see you doing it is for more damage with ganks, as the slow doesn't improve nor does the CD decrease. ' Drunken Rage doesn't scale well' is true, only giving 2% reduction per rank but it gives 3 times the mana of rank 1 W, so you can easily go without blue buff and spam more barrels without having mana issues as badly. I don't like the idea of maxing E and using it for damage in teamfights since you're squishy AP and can be focused down quickly, but maybe when played well that won't happen, so I'm entirely willing to withdraw this statement.
[*] Do you have to use AS reds? I know they work well with Drunken Rage AD buff so they're a good option, but I use magic pen and I feel spamming low cooldown E is enough to clear with. Post-SotSW I barely need to autoattack the small camps since Q-E wipes them out quickly. I would've liked an explanation for runes but there's no rune explanation :(
[*] No items in the cheat sheet :( Not a big deal since I could just look at the items section but it's just disturbing to look at.
[*] Would using 21/0/9 instead of 21/9/0 be alright or will it make you too weak on your first clear?

Please, don't take this as me criticizing anything in the guide. It's concise, short and accurate, so I simply don't have much to comment on it. I would really appreciate answers to the above though.