The 10 team tournament is double elimination. would be hard to have a 14 team double elimination tournament, although I guess they could start with making spots 7 to 14 have a play-in game to get to the 10 team double elimination format.
I guess they chose the 10 team double elimination format to try to put some more small emphasis on regular season? Or perhaps to help their bubble teams avoid low RPI games late at the end of the season?