I do wonder if they could do Baker for live-action Clones and just not have them take their helmet off. Especially with how associated his voice is for them.
That would also include James Earl Jones for Vader, I guess.
Unless Anakin only appears in flashbacks or some kind of vision it's entirely possible James Earl Jones or Matt Sloane is involved.
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For anyone that needs to know why OMD is awful please search the internet for Linkara' s video's specifically his One more day review or his One more day Analysis.