I would Say That Hiroyuki Suzuki is the Goat. When divisions other than 1a are considered the conversation gets harder, but in terms of 1a it is clear. In the the most popular and competitive style of yoyo, there is no one who comes close to the prestige and dominance of Hiroyuki Suzuki. From 2002 to 2013 he earned a top 4 placement, taking home the title 4 of those years. No one else has shown that level of dominance in 1a for such an extended period of time.
If we are including all divisions, I would say that Takeshi Matsuura deserves recognition. He has placed in the top 4 in 3 of the 5 main divisions (1A, 3A, and 5A).
If we are talking the most dominant in their respective category, then Shinji Saito in 2a, and Hajime Miura in 3a should be considered.
That being said, Mir Kim’s 1A performance in this year’s world yoyo contest may be the most incredible yoyo competition performance of all time. If he has another 4 years of this level of dominance, he may become the goat.