Yeah, it's too bad he fought at the peak of LHW with prime Jones and Cormier. Outside of those two, I don't see anyone beating him via grappling. He dominated Phil Davis and put Bader to sleep in 13 seconds.
Outside of Poatan (which would be a war), I wouldn't give any LHWs past or present a big chance of finishing Rumble if they chose to stand for 3 to 5 rounds.
I know someone will bring up Vitor but there are a few points
- That wasn't at 205 (where Rumble fought best). Rumble came in way too heavy and had a bad weight cut
- The stand-ups were total BS. I think Rumble knew Belfort was a front-runner who usually faded by R2 against good competition so he decided to take him down and gas him out. The ref made them stand up twice in record time.
- It was in Brazil where much of the reffing was odd and favored Brazilian fighters.