STILLWATER, Okla. — As Tuesday night’s game tipped off, those donning the Jayhawk crimson and blue outnumbered those wearing Oklahoma State orange inside Gallagher-Iba Arena. Halfway through the second half, that disparity only grew, as the Jayhawks dominated the Cowboys and a large number of OSU fans made an early exit. No. 3-ranked Kansas blew out Oklahoma State 90-66 on Tuesday in Stillwater, Oklahoma. Hunter Dickinson scored 21 points and Kevin McCullar added 18 more as KU (15-2, 3-1 Big 12) won its sixth straight game against OSU. The Jayhawks led for 39:12 of game time and never trailed…