From the article:

Markazi noted that former USC athletic director Mike Bohn had told him he wanted to re-retire Bush’s number. USC recently hired Jen Cohen from Washington to be athletic director and Markazi reported that a ceremony to honor the former star “will come sooner than expected” under her leadership.

He also noted that the display of USC Heisman winners jersey numbers in the Coliseum has been rearranged. This is to be expected with current quarterback Caleb Williams having his jersey number, No. 13, festooned in the Coliseum. But Markazi posted a photo that has space for a pair of numbers to be retired.

And only two USC Heisman winners aren’t currently recognized in the display: Williams and Bush.