Why don't you guys get it yet? The most talented teams are always going to be contenders whereas the title contender teams you cite that have lowly ranked experienced veterans are a flash in the pan where a number of things happened where you have a perfect storm of a roster staying around for 4 years, meshing and outplaying their ranking.
If Coach K or Cal could identify which of the top 15 HS kids will stick around for 3 years, they would take those guys but they don't have that crystal ball.
UNC had Pinson, Justin Jackson and Joel Berry stick around while everyone ranked around them left for the NBA after 1 year which helped them get to the NCAA title game in 2017 and 2018.
http://www.espn.com/college-sports/basketball/recruiting/playerrankings/_/class/2014/order/true
1. Jahlil Okafor (OAD)
2. Myles Turner (OAD)
3. Cliff Alexander (Bust OAD)
4. Tyus Jones (OAD)
5. Emmanuel Mudiay (Overseas OAD)
6. Trey Lyles (OAD)
7. Stanley Johnson (OAD)
8. Justin Jackson (stays at UNC for 3 years, I guess he loved school!)
9. Karl Towns (OAD)
10. Theo Pinson (stays at UNC for 4 years, a true scholar!!)
11. Kelly Oubre (OAD)
12. Kevon Looney (OAD)
13. D'Angelo Russell (OAD)
14. Isaiah Whitehead (stress fracture freshman year, 2 and Done)
15. Justise Winslow (OAD)
16. Isaac Copeland (Bust)
17. Joel Berry (stays at UNC for 4 years, another scholar and gentleman apparently!)
18. Devin Booker (OAD)
19. Rashad Vaughan (OAD)
20. James Blackmon Jr. (3 year player)
Out of the top 20 HS recruits in 2014, only the 3 UNC guys stayed 3 years in college besides James Blackmon from IU and Isaac Copeland who's a bust.