Who was the Gym Buster in Garou: Mark of the Wolves?

Does anyone know who the gym buster is supposed to be at the end of Marco Rodriguez's ending? He comes back to the dojo after defeating Kain R. Heinlein, and the remaining student breaks the bad news to him, so he rushed out to kick that gym buster's ass. Judging from the student and Marco Rodriguez's words, they already know who the gym buster is. I know it's intentionally shrouded in mystery, supposed to be left unresolved until Garou: Mark of the Wolves 2, but is there some official spoiler from SNK in regards to the gym buster's identity?

I'm not completely sure but I've heard that the Gym Buster is Ryuji Yamazaki*. This is only from what I've heard so don't take it as fact.

*Yamazaki had a hobby of beating up people and attacking entire dojos full of students to sedate his violent nature.