But if you rim a good opponent at startup and they restart on the other side of the world and grow again they win by default since you don't really play past early game, right?
I wouldn't really consider that to be them winning. They might have a greater chance to win the world, but they still lost the encounter.
Also, since you rimmed that opponent at startup does that make you better than him? Not necessarily.
Oh, one off events definitely do not determine who is better. I consider consistency to be key.
Again, you were perhaps more active and therefore farmed more than him so therefore, your village was more well developed and obviously you have more troops.
I don't think that's the big variable to be honest. It's easy to beat someone who has more troops than you, especially since most people play O-heavy early on. It's more likely to be decided by catching someone offline, superior decision making, or by timing skills.
For example, the scenario I mentioned of rimming rank 1 as my first target.
I sent 2 nobles, he mailed me and called me a moron. He said I was an overly arrogant idiot for trying to noble him in two trips and that I'd learn to take him seriously after he backtimed me. He'd farmed more resources than me, he had about as many troops as me as well, IIRC he had more lc, I had more axes. The problem was he went all offense, and he underestimated me - or perhaps more accurately, he thought I underestimated him. I wasn't taking two trips, I'd never try to take two trips vs. a top player (except maybe if I was stacked and was trying to bait a backtime, but even then unlikely), I was in fact taking him more serious than if I'd sent a train. If I sent a train it'd be hard to have big enough escorts to prevent the death of my nobles if he split me, and I knew he'd probably split me because he was a speed player well known for his timing abilities, but he was arrogant, and rather than expect I had someone else sending 2 more nobles he assumed I was daft enough to try and take 2 trips.
The account in question was played by trapkid, Miggy, and Grant. Grant and Miggy are very well known, both been rank 1 numerous times, and are good players. I'm biased, I think I'm probably better than they are, but I'd never try and use that one world I rimmed them on as absolute proof of that.