Not confirmed, but looks like Sir Lawrence might be wearing No. 99 for the Buckaroos ... that's going from one extreme (1, at VCU) to another (99) ...
No. 1 is unavailable because it was retired in honor of The Big O, Oscar Robertson. Strange situation, there. Robertson is the greatest statistical perimeter player of all time (25.7 ppg, 9.5 rpg, 7.5 ast per game, for career, better than Magic, Jordan, Bryant, etc.).
However, His O'ness only played the final four of his 14 seasons in Wisconsin. Robertson's No. 14 with Cincy Royals (now Sacramento Kings) was also retired ... a rare situation where a pro athlete has jersey retired by two organizations.
Topping Robertson is Wilt Chamberlain, who had his No. 13 retired by the Harlem Globetrotters, Los Angeles Lakers, Philadelphia 76ers and Philadelphia/Golden State Warriors. His No. 13 is also retired at Kansas ... but the Jayhawks waited until 1998. Chamberlain left KU (a year early) following the '57 season in which the Jayhawks lost to UNC in triple OT in the NCAA finals.