#4 (Tie): SingSing
SingSing unexpectedly announced his retirement from the pro scene. You can read the interview here: https://dotablast.com/singsing-interview-retirement/
#4 (Tie): Baumi
Baumi reached the 200k YouTube subscriber milestone in mid-October! This period, he and Admiral Bulldog dominated the YouTube video views category. Fun fact: Every one of Baumi's videos that broke 100k views during the current period were of Dota 2 mods.
#3: D2Bowie
D2Bowie has been consistently ranked in the top 5 since his first appearance in August. D2Bowie recently surpassed 50k subscribers on YouTube and was given shout-outs by two veteran streamers and pro players: EternaLEnVy and Wagamama.
#2: Arteezy
Arteezy's back on Twitch and it looks like he's here to stay! His four-period absence earlier this year was the result of a streaming deal that his former team, Team Secret, had with the Chinese streaming platform Panda.TV. This period, Arteezy has been playing a lot of soloq under a smurf account. He and his new team, Evil Geniuses, are off to a great start; they placed 1st in the MarsTV Dota 2 League 2016 Autumn tournament.
#1: Admiral Bulldog
Admiral Bulldog, the undisputed champion of the rankings, once again claims the throne! Not many have the unique combination of skill and entertainment value that Admiral Bulldog brings to the table. Admiral Bulldog recently hit 100k subscribers on YouTube and 300k followers on Twitch. He's no longer with team Alliance, but the split appears to be amicable.