General may have a different concensus than classic so here goes. I have him top 10, maybe 5. Only heavyweights btw.
Most people's ATG lists constitutes of best fighters in their lifetime + 1 or 2 celebs from the history they never truly watched anything beyond free TV documentary level. There are very, and I mean very few people who can soundly make this judgement. And I'm certainly not one of them.
I think in Russia it's called Koydiila or something, but it's worst than crack and Meth. He smoking it fo sho!
I would guess top 10 at HW. Problem with HW is that I think historically it is harder to rank than any other division as many HWs from yesteryear would possibly be CWs and LHWs today. If I was to look at HWs of the last 35 years, say from 1980 to today there is a good few HWs where you could make arguements for any - L Lewis, M Tyson, L Holmes, R Bowe, V Klitschko, W Klitschko, E Holyfield.
High atg, has set standards that will be hard to get near never mind equal. I like having a dominant champ who everybody recognises, not duckers and abc frauds.