That means pretty much nothing. There are any number of reasons a matchup like that might not happen. A lot of Euro players don't gamble. Some players might be risk-averse. Some might not have backers. And then there's problems with negotiations, etc. For an Asian player to come to the US just to play Shane, that requires a flight and expenses. If there's a backer involved, then the backer is already laying odds because the player gets paid out of the winnings. So the expected chances of winning have to be well over 50% in order to make it a profitable venture.
What determines the best player is actual play, not woofing.
If Ko and Shane race to 100, I'd bet on Ko. Not because I'm sure that Ko is the better player, but because the evidence (limited as it is) suggests it's more likely that he would win.
What evidence? The results of two short sets?
If they wanted to play Shane they could have the past August. They don't want to play and that is the simple fact.
I mean that is the bottom line. They had every chance to bet 50k or more and the answer was no. They wanted nonpart of playing Shane a long race. And there might have been 20k bet on the race to 21 but it is 100% that Shane didn't bet anywhere near that nor did his backers.
So Ko can get played anytime. When the opportunity and momentum was on his side they ducked.