In 2012 UK had a great team. Davis was a transcendent player, but Jones, Kidd-Gilchrist and others were also heavily involved. That team was a couple of bad bounces away from going unbeaten (Indiana beat them on a buzzer beater, Vandy won the SEC title game).
The 2015 Duke squad didn't really get a cakewalk. Their bracket as the #1 seed was 16, 8, 5, 2. In the Final Four, they got Michigan State (a 7 seed that got hot) then Wisconsin after the Badgers knocked off unbeaten Kentucky.
Can an OAD team win it all. Yes. Duke and Kentucky have both shown that. Will it happen regularly? Probably not, because in any given year, there will only be one or two teams with enough OAD star power to get it done, and some years there won't even be that. And then that OAD team has to survive the season, including injuries, bad luck, etc.
Every national champion has to get a little lucky along the way. Virginia got a big call that went their way in the national semifinal, and they probably should have lost to Purdue in regulation in the regional final anyway. But they won the title (deservedly), so its their poise and experience that got them through. Nevermind that the same team lost to a 16 seed a year prior in part because they were banged up.
If you go through the last several title teams, basically every single one has had a game where they had to get a borderline call, or a fortunate bounce, in order to win the title. That's the nature of winning six straight single elimination games. Somebody gets the bounces. Somebody else doesn't. There is generally not enough of a talent separation in college basketball to make luck irrelevant.
@KUSTEVE, Yes, guys outside the Top 100 make the NBA. It happens every year. But run down the list of draftees again and you will notice something.
Here's the list of guys that were top 40 recruits coming out of HS that were drafted this year:
Williamson, Barrett, Garland, White, Hayes, Reddish, Washington, Herro, Langford, Bazley, Little, Johnson, Bol, Porter, Walker, Waters and Hands.
That's 17 of the 60 players drafted. Nearly 30% of the draft was high ranked players. 7 guys were international and not ranked. 7 others were ranked between 40 and 75.
So roughly one third of players drafted were high ranked players. About 10% each were either international or "mid range" players. The other roughly half the draft was ranked below that.
You may think that proves that the rankings are flawed, but it actually proves how accurate they are.
Looking back at ESPN's 2017 rankings, there are 18 guys that are not currently either in the NBA or on a 2 way contract. That's means 22 either are in the NBA or have signed two way contracts. That's more than half. And most of the guys that haven't are still in college (only Jontay Porter, Brandon McCoy and Billy Preston left college and were undrafted). So out of that top 40, 15 are still in college and could in theory be drafted next year or the following year.
That suggests that the rankings identified the best players pretty well, since after two years, most of those guys ranked high have already moved to the pros.