I refuse to look into the rankings of all services but I have looked into the Rivals rankings and Florida won back to back titles without a single recruit ranked in the top 30. I have no idea what some of those players were ranked on other sites. Florida had a large collection of top 150 players. One or two were ranked in the top 50 but not better than 31.
Did you know? In the history of Rivals Rankings (2003 is as far back as I could find) a #1 rated recruit has never won a National Championship. In fact, the top 3 recruits from 2003 to present have won a total of 2 championships; both by 2011 Kentucky (#2 Anthony Davis, #3 Michael Kidd-Gilchrest). In comparison, recruits ranked 98-100 have won 1 Championship during the same time period--#98 Shabazz Napier, 2013 UCONN.
I like scout so I'm going to use their rankings. I'm going to list the highest rated player that went to college.
2002 - Carmelo Anthony was the highest rated player to go to college. Won national championship
2003 - Luol Deng - final 4
2004 - Rudy Gay - lost in the 2nd rd. returned as a soph and went final4
2005 - Josh McRoberts - lost in sweet 16, returned and lost in 1st rd
2006 - Greg Oden - lost in the national championship
2007 - OJ Mayo - lost in the first rd
2008 - Samardo Samuels - lost in the elite 8, returned lost in the 1st rd
2009 - Derrick Favors - lost in 2nd rd
2010 - Harrison Barnes - lost in the elite 8, returned lost in the elite 8
2011 - Anthony Davis - national championship
2012 - Nerlens Noel - Nit (tore acl)
2013 - Andrew Wiggins - lost in 3rd rd
2014 - Jahlil Okafor - currently #2 in the country