I strongly disagree in regards to Randy, there are numerous HW fighters that surpass his ability when you compare relative primes and even LHW's. His record is not very good regardless pf the quality of his opponents, to state he's the best ever suggests that you do not have a broad knowledge of this sport or in depth knowledge of its history. But i realise that it is your opinion and for that reason alone i can respect it without need for you to justify it.
I look to fighters like Igor - the Fedor prototype who seemed to walk straight through anything you hit him with until injuries and the quality of opposition caught up with him. He was a trail blazer, dominating almost everyone in all organisations he fought in to the point that people feared the name before ever seeing the man. His only early questionable result was his 1st fight against Nick Nutter when they were stood up with Nutter controlling and dominating. The rematch was very very different.
Alot of people would say Mark Kerr but in reality he was nothing without the drugs, and he didnt exactly have stellar opposition on his record. Bas was amazing and could have made him one of the all time marquee names however he couldnt manage his own demons and dragged people down.
What Igor did for stand up, Coleman did for GnP and set a new standard for victory. His relentless pursuit of the takedown combined with his ridiculous strength made for a very slow, agonising recovery for most of his opponents. Hes fought too long trying to keep his name in lights and make a few extra $$ but at his all time peak he was the true smashing machine.
Fedor stands alone in what he was able to do - he outstruck the best strikers, out grappled the best wrestlers and out manouvered the best ground fighters in the world. I really do not think we will see anyone at that level in my lifetime unless Bones steps up and lives up to his potential.
Afterall, potential is just that - essentially it means nothing.