it doesn't really help to correlate the idea with the progenitor of the idea. yeah, real knows real, we get it. offer a real take on why Silva isn't the GOAT--easy enough...he was roiding, MW was weak, he was great until people figured out his counter punching, etc.
let me help with Fedor. he got KTFO by an aged MW who had become more and more one-dimensional as a fighter by the time they fought. and fedor cheated his way to a win over another one-dimensional MW by grabbing the ropes and preventing the td.
i think GSP has had the better career than Silva, so I agree with Khabib. but not because Khabib is this or that.