I agree with you. But Coldzera is not to compare with those "unknown" people that you mentioned. He won the Majors being the MVP, without counting the other titles and MVP's that he won. Only Get_Right did that, if I'm not mistaken. Everybody knows Coldzera and they know the things he's capable of. He is already a player with the legend stat, and now he has the opportunity to give one more step, if this change works for him, ofc.
And I don't like the GOAT thing, 'cause it is too subjective. I'm talking about the most victorious player. With more majors and important titles and MVP's. Simple as that.
About Fallen, I put him as a legend of the esports in general. Idk, it's not fair to compare him with Coldzera if we'd consider the "out-game" achievments, etc. xD