Well, remembering that the target is to win an NCAA Championship, then Iwould think Title Team Rosters is what we need to be comparing ourselves to - not simply "other D-1 teams".
2012: Kentucky: Anthony Davis 6'10 (per KY Roster)
2011: UCONN: Oriaki 6'9, Okandwu 7'0, Wolfe 7'1, Bradley 6'10
2010: Duke: Zoubek 7'1, Plumlee 6'10, Plumlee 6'10
2009: UNC: Deon Thompson 6'8, Tyler Zeller 7'0
2008: Kansas: Sasha Kaun 6'11, Cole Aldrich 6'11
2007: Florida: Joakim Noah 6'11, Al Horford 6'10
2006: Florida: Joakim Noah 6'11, Al Horford 6'10
2005: UNC: Sean May 6'8, Damion Grant 6'11
2004: UCONN: Emeka Okafor 6'10, Hilton Armstrong 6'11
2003: Syracuse: Craig Forth 7'0
2002: Maryland: Lonny Baxter 6'8, Chris Wilcox 6'10
2001: Duke: Carlos Boozer 6'9, Casey Sanders 6'11
2000: Michigan State: Mike Chappell 6'9, Aloysius Anagonye 6'8
1999: UCONN: Jake Voskuhl 6'11, souleymane Wane 6'11
1998: Kentucky: Nazr Mohammad 6'10, Jamal Magliore 6'10
1997: Arizona: AJ Bramlett 6'11, Donnell Harris 6'11
1996: Kentucky: Nazr Mohammad 6'10, Mark Pope 6'10
1995: UCLA: George Zidek 7'0, omm'A Givens 6'11, Ike Nwankwo 6'11
You CAN win a title with a short starting post, but it's rare - and there's almost always a skyscrper on the bench for those inevitable matchup problems were all you really need is BIG on the floor.
Steve Lavin knows this - so I don't think he's done with only 6'8 and 6'9 up front.
His record:
1997: Jelani McCoy 6'10, JR Henderson 6'8
1998: Jelani McCoy 6'10, Travis Reed 6'8
1999: 6'11 Dan Gadzuric, 6'11 Jerome Moiso
2000: 6'11 Dan Gadzuric, 6'11 Jerome Moiso
2001: 6'11 Dan Gadzuric, 6'10 John Hoffart
2002: 6'11 Dan Gadzuric, 6'10 John Hoffart
2003: 7'0 Ryan Hollins, 6'11 Michael Fey
FYI - of that group, McCoy, Henderson, Gadzuric, Moiso, and Hollis all made the NBA, Fey and Reed were both NBDL players. Reed went on to be a Euro STAR. Hoffart was a deep bench reserve, but did save at least two games just by being BIG (6'10 270) and SMART (3.9 GPA) when Gadzuric got into foul trouble and the particular matchups didn't allow the team to go "small". Lavs had been recruiting (for 2 years) former St. Anthony's center 7'0 Josh Moore - who was a real academic question mark, so as a hedge, Lav's also accepted Hoffart as a transfer fromthe Cal Poly San Louis Obispo Banana Slugs
Good move, as Moore never did qualify (tho he did eventually make the Clippers roster!).....