They aren't playing backup though since Yelich is basically the full time DH now, so one of them has to be the starter. I do think Perkins makes and stays on the team no matter what, but he is like permanently the backup. Like if they start out with Mitchell and he fails, I think Lockridge comes up to be the starter and Perkins stays in the backup role for example.
The good news in general is there's a ton of options so you hope one of them pans out, be it Mitchell, Lockridge, Jett, put Chourio in CF and Bauers in LF, hell maybe Baddoo tears up AAA and gets a shot in LF etc.