If a time machine could bring a fighter back in time two years to face themselves two years ago, which current fighters do you think would beat that version of themselves two years ago and which would lose to their former self. Then you can consider how about 5 years ago? or 10 Years ago? The sky is the limit. Strangely, I think Frank Mir whom just beat Todd duffee, could probably beat the Frank Mir who was in the middle of a four fight losing streak back in 2013. Current Dan Henderson would probably be a very even match for his former self of two years ago.