Keisei could transfer, but I don't think he will be interested in doing so if Fred is back. Eli Rice is an interesting player, I don't know what his impact will be right away next year. The one that's on the team is Ramel Lloyd Jr, who is 6'6" and probably a wing player. He was very good in high school. Also Quaran McPherson was figured to play a LOT of PG this year (rs last year and was still a bench leader) until he was injured right before the season began.
With Gary and Keita, maybe Breidenbach and Kojenets figure out how to contribute OR they get a bigger transfer forward, they should be able to do something.
They will miss Walker no matter what, as well as Griesel and Bandoumel.