Odorizzi should be better than Walker. There are a number of buy-lows and old guys: Kluber, Quintana, Porcello, Archer, Richards, Happ, Shoemaker, Dick Mountain, etc. Whether any of them are preferable to Walker is hard to say. I am not a huge fan of Walker's indicators from 2020 but he is the youngest option (him, Rodon, and Aaron Sanchez are all 28).