The fact remains that in the case of identity theft, it is not the case that the thing being stolen must be a singular finite thing that is removed from your possession, which directly contradicts your original statement, which your entire argument depends on. You claim that it isn’t theft because his voice is “still where he left it”. Well in the crime of identity theft your identity remains right where you left it. This is the point you keep missing.
As for the Dowling v. United States ruling, it’s not the case that the judge held that copyright infringement isn’t theft, you’ve misinterpreted it entirely. What was held was that “Copies of copyrighted works cannot be regarded as "stolen property" for the purposes of a prosecution under the National Stolen Property Act of 1934.”
That is a very narrow ruling that clarified the definition of stolen property only as it applies to potential prosecution over law unrelated to copyright infringement. Like I said, there are different types of theft, and this ruling simply solidified the difference between crimes of the nature of theft, and larceny.