I do not have a link that shows the records (in terms of best teams versus weakest teams) of playoff winners. I could provide you with several other links supporting the crapshoot theory. Keep in mind, when I say the playoffs are a crapshoot, I'm not saying that the odds of every team winning the championship are perfectly equal. I am saying that the odds are not significantly different enough to really matter. Yes, the better teams have a slightly better chance of winning than the weaker teams, but that difference is really not significant.
In the 20 year period beginning with the wildcard era (1996-2015), the best team won the World Series 4 times. The wildcard team won the WS 6 times. Yes, that is anecdotal.
The saber community has widely studied this, and they largely agree that the playoffs are a crapshoot. IMO, the fact that no one can find any stat or combination of stats, trait, or quality of the regular season that correlates to postseason wins is the very definition of randomness or crapshoot. The R^2 between regular season wins and postseason wins is approximately .1, meaning that about 10% of postseason wins can be explained by or attributed to regular season wins. In other words, there is very little correlation between the two. And that is the strongest correlation that has been found between anything and postseason wins.